YES
* Step 1: TrivialSCCs YES
    + Considered Problem:
        Rules:
          0. start(A,B,C,D,E,F)  -> lbl71(A,B,1,D,0,F)     [E + -1*F >= 0         (?,1)
                                                            && -1*E + F >= 0           
                                                            && C + -1*D >= 0           
                                                            && -1*C + D >= 0           
                                                            && A + -1*B >= 0           
                                                            && -1*A + B >= 0           
                                                            && A >= 2                  
                                                            && B = A                   
                                                            && C = D                   
                                                            && E = F]                  
          1. start(A,B,C,D,E,F)  -> stop(A,B,0,D,1,F)      [E + -1*F >= 0         (?,1)
                                                            && -1*E + F >= 0           
                                                            && C + -1*D >= 0           
                                                            && -1*C + D >= 0           
                                                            && A + -1*B >= 0           
                                                            && -1*A + B >= 0           
                                                            && 1 >= A                  
                                                            && B = A                   
                                                            && C = D                   
                                                            && E = F]                  
          2. lbl71(A,B,C,D,E,F)  -> lbl71(A,B,1 + C,D,E,F) [-2 + B + -1*E >= 0    (?,1)
                                                            && -2 + A + -1*E >= 0      
                                                            && E >= 0                  
                                                            && -1 + C + E >= 0         
                                                            && -2 + B + E >= 0         
                                                            && -2 + A + E >= 0         
                                                            && -1 + B + -1*C >= 0      
                                                            && -1 + A + -1*C >= 0      
                                                            && -1 + C >= 0             
                                                            && -3 + B + C >= 0         
                                                            && -3 + A + C >= 0         
                                                            && A + -1*B >= 0           
                                                            && -2 + B >= 0             
                                                            && -4 + A + B >= 0         
                                                            && -1*A + B >= 0           
                                                            && -2 + A >= 0             
                                                            && A >= 2 + C              
                                                            && A >= 1 + C              
                                                            && A >= 2 + E              
                                                            && C >= 1                  
                                                            && B = A]                  
          3. lbl71(A,B,C,D,E,F)  -> cut(A,B,C,D,1 + E,F)   [-2 + B + -1*E >= 0    (?,1)
                                                            && -2 + A + -1*E >= 0      
                                                            && E >= 0                  
                                                            && -1 + C + E >= 0         
                                                            && -2 + B + E >= 0         
                                                            && -2 + A + E >= 0         
                                                            && -1 + B + -1*C >= 0      
                                                            && -1 + A + -1*C >= 0      
                                                            && -1 + C >= 0             
                                                            && -3 + B + C >= 0         
                                                            && -3 + A + C >= 0         
                                                            && A + -1*B >= 0           
                                                            && -2 + B >= 0             
                                                            && -4 + A + B >= 0         
                                                            && -1*A + B >= 0           
                                                            && -2 + A >= 0             
                                                            && A >= 3 + E              
                                                            && A >= 2 + E              
                                                            && A >= 2                  
                                                            && 1 + C = A               
                                                            && B = A]                  
          4. lbl71(A,B,C,D,E,F)  -> stop(A,B,C,D,1 + E,F)  [-2 + B + -1*E >= 0    (?,1)
                                                            && -2 + A + -1*E >= 0      
                                                            && E >= 0                  
                                                            && -1 + C + E >= 0         
                                                            && -2 + B + E >= 0         
                                                            && -2 + A + E >= 0         
                                                            && -1 + B + -1*C >= 0      
                                                            && -1 + A + -1*C >= 0      
                                                            && -1 + C >= 0             
                                                            && -3 + B + C >= 0         
                                                            && -3 + A + C >= 0         
                                                            && A + -1*B >= 0           
                                                            && -2 + B >= 0             
                                                            && -4 + A + B >= 0         
                                                            && -1*A + B >= 0           
                                                            && -2 + A >= 0             
                                                            && A >= 2                  
                                                            && 2 + E = A               
                                                            && 1 + C = A               
                                                            && B = A]                  
          5. cut(A,B,C,D,E,F)    -> lbl71(A,B,1,D,E,F)     [-1 + C + -1*E >= 0    (?,1)
                                                            && -2 + B + -1*E >= 0      
                                                            && -2 + A + -1*E >= 0      
                                                            && -1 + E >= 0             
                                                            && -3 + C + E >= 0         
                                                            && -4 + B + E >= 0         
                                                            && -4 + A + E >= 0         
                                                            && -1 + B + -1*C >= 0      
                                                            && -1 + A + -1*C >= 0      
                                                            && -2 + C >= 0             
                                                            && -5 + B + C >= 0         
                                                            && 1 + -1*B + C >= 0       
                                                            && -5 + A + C >= 0         
                                                            && 1 + -1*A + C >= 0       
                                                            && A + -1*B >= 0           
                                                            && -3 + B >= 0             
                                                            && -6 + A + B >= 0         
                                                            && -1*A + B >= 0           
                                                            && -3 + A >= 0             
                                                            && A >= 2                  
                                                            && A >= 2 + E              
                                                            && E >= 1                  
                                                            && 1 + C = A               
                                                            && B = A]                  
          6. start0(A,B,C,D,E,F) -> start(A,A,D,D,F,F)     True                   (1,1)
        Signature:
          {(cut,6);(lbl71,6);(start,6);(start0,6);(stop,6)}
        Flow Graph:
          [0->{2,3,4},1->{},2->{2,3,4},3->{5},4->{},5->{2,3,4},6->{0,1}]
        
    + Applied Processor:
        TrivialSCCs
    + Details:
        All trivial SCCs of the transition graph admit timebound 1.
* Step 2: UnsatPaths YES
    + Considered Problem:
        Rules:
          0. start(A,B,C,D,E,F)  -> lbl71(A,B,1,D,0,F)     [E + -1*F >= 0         (1,1)
                                                            && -1*E + F >= 0           
                                                            && C + -1*D >= 0           
                                                            && -1*C + D >= 0           
                                                            && A + -1*B >= 0           
                                                            && -1*A + B >= 0           
                                                            && A >= 2                  
                                                            && B = A                   
                                                            && C = D                   
                                                            && E = F]                  
          1. start(A,B,C,D,E,F)  -> stop(A,B,0,D,1,F)      [E + -1*F >= 0         (1,1)
                                                            && -1*E + F >= 0           
                                                            && C + -1*D >= 0           
                                                            && -1*C + D >= 0           
                                                            && A + -1*B >= 0           
                                                            && -1*A + B >= 0           
                                                            && 1 >= A                  
                                                            && B = A                   
                                                            && C = D                   
                                                            && E = F]                  
          2. lbl71(A,B,C,D,E,F)  -> lbl71(A,B,1 + C,D,E,F) [-2 + B + -1*E >= 0    (?,1)
                                                            && -2 + A + -1*E >= 0      
                                                            && E >= 0                  
                                                            && -1 + C + E >= 0         
                                                            && -2 + B + E >= 0         
                                                            && -2 + A + E >= 0         
                                                            && -1 + B + -1*C >= 0      
                                                            && -1 + A + -1*C >= 0      
                                                            && -1 + C >= 0             
                                                            && -3 + B + C >= 0         
                                                            && -3 + A + C >= 0         
                                                            && A + -1*B >= 0           
                                                            && -2 + B >= 0             
                                                            && -4 + A + B >= 0         
                                                            && -1*A + B >= 0           
                                                            && -2 + A >= 0             
                                                            && A >= 2 + C              
                                                            && A >= 1 + C              
                                                            && A >= 2 + E              
                                                            && C >= 1                  
                                                            && B = A]                  
          3. lbl71(A,B,C,D,E,F)  -> cut(A,B,C,D,1 + E,F)   [-2 + B + -1*E >= 0    (?,1)
                                                            && -2 + A + -1*E >= 0      
                                                            && E >= 0                  
                                                            && -1 + C + E >= 0         
                                                            && -2 + B + E >= 0         
                                                            && -2 + A + E >= 0         
                                                            && -1 + B + -1*C >= 0      
                                                            && -1 + A + -1*C >= 0      
                                                            && -1 + C >= 0             
                                                            && -3 + B + C >= 0         
                                                            && -3 + A + C >= 0         
                                                            && A + -1*B >= 0           
                                                            && -2 + B >= 0             
                                                            && -4 + A + B >= 0         
                                                            && -1*A + B >= 0           
                                                            && -2 + A >= 0             
                                                            && A >= 3 + E              
                                                            && A >= 2 + E              
                                                            && A >= 2                  
                                                            && 1 + C = A               
                                                            && B = A]                  
          4. lbl71(A,B,C,D,E,F)  -> stop(A,B,C,D,1 + E,F)  [-2 + B + -1*E >= 0    (1,1)
                                                            && -2 + A + -1*E >= 0      
                                                            && E >= 0                  
                                                            && -1 + C + E >= 0         
                                                            && -2 + B + E >= 0         
                                                            && -2 + A + E >= 0         
                                                            && -1 + B + -1*C >= 0      
                                                            && -1 + A + -1*C >= 0      
                                                            && -1 + C >= 0             
                                                            && -3 + B + C >= 0         
                                                            && -3 + A + C >= 0         
                                                            && A + -1*B >= 0           
                                                            && -2 + B >= 0             
                                                            && -4 + A + B >= 0         
                                                            && -1*A + B >= 0           
                                                            && -2 + A >= 0             
                                                            && A >= 2                  
                                                            && 2 + E = A               
                                                            && 1 + C = A               
                                                            && B = A]                  
          5. cut(A,B,C,D,E,F)    -> lbl71(A,B,1,D,E,F)     [-1 + C + -1*E >= 0    (?,1)
                                                            && -2 + B + -1*E >= 0      
                                                            && -2 + A + -1*E >= 0      
                                                            && -1 + E >= 0             
                                                            && -3 + C + E >= 0         
                                                            && -4 + B + E >= 0         
                                                            && -4 + A + E >= 0         
                                                            && -1 + B + -1*C >= 0      
                                                            && -1 + A + -1*C >= 0      
                                                            && -2 + C >= 0             
                                                            && -5 + B + C >= 0         
                                                            && 1 + -1*B + C >= 0       
                                                            && -5 + A + C >= 0         
                                                            && 1 + -1*A + C >= 0       
                                                            && A + -1*B >= 0           
                                                            && -3 + B >= 0             
                                                            && -6 + A + B >= 0         
                                                            && -1*A + B >= 0           
                                                            && -3 + A >= 0             
                                                            && A >= 2                  
                                                            && A >= 2 + E              
                                                            && E >= 1                  
                                                            && 1 + C = A               
                                                            && B = A]                  
          6. start0(A,B,C,D,E,F) -> start(A,A,D,D,F,F)     True                   (1,1)
        Signature:
          {(cut,6);(lbl71,6);(start,6);(start0,6);(stop,6)}
        Flow Graph:
          [0->{2,3,4},1->{},2->{2,3,4},3->{5},4->{},5->{2,3,4},6->{0,1}]
        
    + Applied Processor:
        UnsatPaths
    + Details:
        We remove following edges from the transition graph: [(0,3),(5,3),(5,4)]
* Step 3: Looptree YES
    + Considered Problem:
        Rules:
          0. start(A,B,C,D,E,F)  -> lbl71(A,B,1,D,0,F)     [E + -1*F >= 0         (1,1)
                                                            && -1*E + F >= 0           
                                                            && C + -1*D >= 0           
                                                            && -1*C + D >= 0           
                                                            && A + -1*B >= 0           
                                                            && -1*A + B >= 0           
                                                            && A >= 2                  
                                                            && B = A                   
                                                            && C = D                   
                                                            && E = F]                  
          1. start(A,B,C,D,E,F)  -> stop(A,B,0,D,1,F)      [E + -1*F >= 0         (1,1)
                                                            && -1*E + F >= 0           
                                                            && C + -1*D >= 0           
                                                            && -1*C + D >= 0           
                                                            && A + -1*B >= 0           
                                                            && -1*A + B >= 0           
                                                            && 1 >= A                  
                                                            && B = A                   
                                                            && C = D                   
                                                            && E = F]                  
          2. lbl71(A,B,C,D,E,F)  -> lbl71(A,B,1 + C,D,E,F) [-2 + B + -1*E >= 0    (?,1)
                                                            && -2 + A + -1*E >= 0      
                                                            && E >= 0                  
                                                            && -1 + C + E >= 0         
                                                            && -2 + B + E >= 0         
                                                            && -2 + A + E >= 0         
                                                            && -1 + B + -1*C >= 0      
                                                            && -1 + A + -1*C >= 0      
                                                            && -1 + C >= 0             
                                                            && -3 + B + C >= 0         
                                                            && -3 + A + C >= 0         
                                                            && A + -1*B >= 0           
                                                            && -2 + B >= 0             
                                                            && -4 + A + B >= 0         
                                                            && -1*A + B >= 0           
                                                            && -2 + A >= 0             
                                                            && A >= 2 + C              
                                                            && A >= 1 + C              
                                                            && A >= 2 + E              
                                                            && C >= 1                  
                                                            && B = A]                  
          3. lbl71(A,B,C,D,E,F)  -> cut(A,B,C,D,1 + E,F)   [-2 + B + -1*E >= 0    (?,1)
                                                            && -2 + A + -1*E >= 0      
                                                            && E >= 0                  
                                                            && -1 + C + E >= 0         
                                                            && -2 + B + E >= 0         
                                                            && -2 + A + E >= 0         
                                                            && -1 + B + -1*C >= 0      
                                                            && -1 + A + -1*C >= 0      
                                                            && -1 + C >= 0             
                                                            && -3 + B + C >= 0         
                                                            && -3 + A + C >= 0         
                                                            && A + -1*B >= 0           
                                                            && -2 + B >= 0             
                                                            && -4 + A + B >= 0         
                                                            && -1*A + B >= 0           
                                                            && -2 + A >= 0             
                                                            && A >= 3 + E              
                                                            && A >= 2 + E              
                                                            && A >= 2                  
                                                            && 1 + C = A               
                                                            && B = A]                  
          4. lbl71(A,B,C,D,E,F)  -> stop(A,B,C,D,1 + E,F)  [-2 + B + -1*E >= 0    (1,1)
                                                            && -2 + A + -1*E >= 0      
                                                            && E >= 0                  
                                                            && -1 + C + E >= 0         
                                                            && -2 + B + E >= 0         
                                                            && -2 + A + E >= 0         
                                                            && -1 + B + -1*C >= 0      
                                                            && -1 + A + -1*C >= 0      
                                                            && -1 + C >= 0             
                                                            && -3 + B + C >= 0         
                                                            && -3 + A + C >= 0         
                                                            && A + -1*B >= 0           
                                                            && -2 + B >= 0             
                                                            && -4 + A + B >= 0         
                                                            && -1*A + B >= 0           
                                                            && -2 + A >= 0             
                                                            && A >= 2                  
                                                            && 2 + E = A               
                                                            && 1 + C = A               
                                                            && B = A]                  
          5. cut(A,B,C,D,E,F)    -> lbl71(A,B,1,D,E,F)     [-1 + C + -1*E >= 0    (?,1)
                                                            && -2 + B + -1*E >= 0      
                                                            && -2 + A + -1*E >= 0      
                                                            && -1 + E >= 0             
                                                            && -3 + C + E >= 0         
                                                            && -4 + B + E >= 0         
                                                            && -4 + A + E >= 0         
                                                            && -1 + B + -1*C >= 0      
                                                            && -1 + A + -1*C >= 0      
                                                            && -2 + C >= 0             
                                                            && -5 + B + C >= 0         
                                                            && 1 + -1*B + C >= 0       
                                                            && -5 + A + C >= 0         
                                                            && 1 + -1*A + C >= 0       
                                                            && A + -1*B >= 0           
                                                            && -3 + B >= 0             
                                                            && -6 + A + B >= 0         
                                                            && -1*A + B >= 0           
                                                            && -3 + A >= 0             
                                                            && A >= 2                  
                                                            && A >= 2 + E              
                                                            && E >= 1                  
                                                            && 1 + C = A               
                                                            && B = A]                  
          6. start0(A,B,C,D,E,F) -> start(A,A,D,D,F,F)     True                   (1,1)
        Signature:
          {(cut,6);(lbl71,6);(start,6);(start0,6);(stop,6)}
        Flow Graph:
          [0->{2,4},1->{},2->{2,3,4},3->{5},4->{},5->{2},6->{0,1}]
        
    + Applied Processor:
        Looptree
    + Details:
        We construct a looptree:
          P: [0,1,2,3,4,5,6]
          |
          `- p:[2,5,3] c: [5]
             |
             `- p:[2] c: [2]

YES