MAYBE
317.88/80.65	MAYBE
317.88/80.65	
317.88/80.65	Problem:
317.88/80.65	 active(__(__(X,Y),Z)) -> mark(__(X,__(Y,Z)))
317.88/80.65	 active(__(X,nil())) -> mark(X)
317.88/80.65	 active(__(nil(),X)) -> mark(X)
317.88/80.65	 active(U11(tt())) -> mark(U12(tt()))
317.88/80.65	 active(U12(tt())) -> mark(tt())
317.88/80.65	 active(isNePal(__(I,__(P,I)))) -> mark(U11(tt()))
317.88/80.65	 active(__(X1,X2)) -> __(active(X1),X2)
317.88/80.65	 active(__(X1,X2)) -> __(X1,active(X2))
317.88/80.65	 active(U11(X)) -> U11(active(X))
317.88/80.65	 active(U12(X)) -> U12(active(X))
317.88/80.65	 active(isNePal(X)) -> isNePal(active(X))
317.88/80.65	 __(mark(X1),X2) -> mark(__(X1,X2))
317.88/80.65	 __(X1,mark(X2)) -> mark(__(X1,X2))
317.88/80.65	 U11(mark(X)) -> mark(U11(X))
317.88/80.65	 U12(mark(X)) -> mark(U12(X))
317.88/80.65	 isNePal(mark(X)) -> mark(isNePal(X))
317.88/80.65	 proper(__(X1,X2)) -> __(proper(X1),proper(X2))
317.88/80.65	 proper(nil()) -> ok(nil())
317.88/80.65	 proper(U11(X)) -> U11(proper(X))
317.88/80.65	 proper(tt()) -> ok(tt())
317.88/80.65	 proper(U12(X)) -> U12(proper(X))
317.88/80.65	 proper(isNePal(X)) -> isNePal(proper(X))
317.88/80.65	 __(ok(X1),ok(X2)) -> ok(__(X1,X2))
317.88/80.65	 U11(ok(X)) -> ok(U11(X))
317.88/80.65	 U12(ok(X)) -> ok(U12(X))
317.88/80.65	 isNePal(ok(X)) -> ok(isNePal(X))
317.88/80.65	 top(mark(X)) -> top(proper(X))
317.88/80.65	 top(ok(X)) -> top(active(X))
317.88/80.65	
317.88/80.65	Proof:
317.88/80.65	 Open
317.88/80.65	EOF