MAYBE
194.21/57.67	MAYBE
194.21/57.67	
194.21/57.67	Problem:
194.21/57.67	 a__U11(tt(),M,N) -> a__U12(tt(),M,N)
194.21/57.67	 a__U12(tt(),M,N) -> s(a__plus(mark(N),mark(M)))
194.21/57.67	 a__plus(N,0()) -> mark(N)
194.21/57.67	 a__plus(N,s(M)) -> a__U11(tt(),M,N)
194.21/57.67	 mark(U11(X1,X2,X3)) -> a__U11(mark(X1),X2,X3)
194.21/57.67	 mark(U12(X1,X2,X3)) -> a__U12(mark(X1),X2,X3)
194.21/57.67	 mark(plus(X1,X2)) -> a__plus(mark(X1),mark(X2))
194.21/57.67	 mark(tt()) -> tt()
194.21/57.67	 mark(s(X)) -> s(mark(X))
194.21/57.67	 mark(0()) -> 0()
194.21/57.67	 a__U11(X1,X2,X3) -> U11(X1,X2,X3)
194.21/57.67	 a__U12(X1,X2,X3) -> U12(X1,X2,X3)
194.21/57.67	 a__plus(X1,X2) -> plus(X1,X2)
194.21/57.67	
194.21/57.67	Proof:
194.21/57.67	 Open
194.21/57.68	EOF