(GOAL COMPLEXITY)
(STARTTERM (FUNCTIONSYMBOLS l0))
(VAR A B C D)
(RULES
  l0(A,B,C,D) -> Com_1(l1(0,B,C,D))
  l1(A,B,C,D) -> Com_1(l2(A,B,0,0)) :|: B >= 1
  l2(A,B,C,D) -> Com_1(l2(A,B,C + 1,D + C)) :|: B >= C + 1
  l2(A,B,C,D) -> Com_1(l1(A + D,B - 1,C,D)) :|: C >= B
)