MAYBE
249.60/63.18	MAYBE
249.60/63.19	
249.60/63.19	Problem:
249.60/63.19	 active(U11(tt(),M,N)) -> mark(U12(tt(),M,N))
249.60/63.19	 active(U12(tt(),M,N)) -> mark(s(plus(N,M)))
249.60/63.19	 active(plus(N,0())) -> mark(N)
249.60/63.19	 active(plus(N,s(M))) -> mark(U11(tt(),M,N))
249.60/63.19	 mark(U11(X1,X2,X3)) -> active(U11(mark(X1),X2,X3))
249.60/63.19	 mark(tt()) -> active(tt())
249.60/63.19	 mark(U12(X1,X2,X3)) -> active(U12(mark(X1),X2,X3))
249.60/63.19	 mark(s(X)) -> active(s(mark(X)))
249.60/63.19	 mark(plus(X1,X2)) -> active(plus(mark(X1),mark(X2)))
249.60/63.19	 mark(0()) -> active(0())
249.60/63.19	 U11(mark(X1),X2,X3) -> U11(X1,X2,X3)
249.60/63.19	 U11(X1,mark(X2),X3) -> U11(X1,X2,X3)
249.60/63.19	 U11(X1,X2,mark(X3)) -> U11(X1,X2,X3)
249.60/63.19	 U11(active(X1),X2,X3) -> U11(X1,X2,X3)
249.60/63.19	 U11(X1,active(X2),X3) -> U11(X1,X2,X3)
249.60/63.19	 U11(X1,X2,active(X3)) -> U11(X1,X2,X3)
249.60/63.19	 U12(mark(X1),X2,X3) -> U12(X1,X2,X3)
249.60/63.19	 U12(X1,mark(X2),X3) -> U12(X1,X2,X3)
249.60/63.19	 U12(X1,X2,mark(X3)) -> U12(X1,X2,X3)
249.60/63.19	 U12(active(X1),X2,X3) -> U12(X1,X2,X3)
249.60/63.19	 U12(X1,active(X2),X3) -> U12(X1,X2,X3)
249.60/63.19	 U12(X1,X2,active(X3)) -> U12(X1,X2,X3)
249.60/63.19	 s(mark(X)) -> s(X)
249.60/63.19	 s(active(X)) -> s(X)
249.60/63.19	 plus(mark(X1),X2) -> plus(X1,X2)
249.60/63.19	 plus(X1,mark(X2)) -> plus(X1,X2)
249.60/63.19	 plus(active(X1),X2) -> plus(X1,X2)
249.60/63.19	 plus(X1,active(X2)) -> plus(X1,X2)
249.60/63.19	
249.60/63.19	Proof:
249.60/63.19	 Open
249.60/63.19	EOF