MAYBE
283.05/72.12	MAYBE
283.05/72.12	
283.05/72.12	Problem:
283.05/72.12	 active(__(__(X,Y),Z)) -> mark(__(X,__(Y,Z)))
283.05/72.12	 active(__(X,nil())) -> mark(X)
283.05/72.12	 active(__(nil(),X)) -> mark(X)
283.05/72.12	 active(and(tt(),X)) -> mark(X)
283.05/72.12	 active(isNePal(__(I,__(P,I)))) -> mark(tt())
283.05/72.12	 active(__(X1,X2)) -> __(active(X1),X2)
283.05/72.12	 active(__(X1,X2)) -> __(X1,active(X2))
283.05/72.12	 active(and(X1,X2)) -> and(active(X1),X2)
283.05/72.12	 active(isNePal(X)) -> isNePal(active(X))
283.05/72.12	 __(mark(X1),X2) -> mark(__(X1,X2))
283.05/72.12	 __(X1,mark(X2)) -> mark(__(X1,X2))
283.05/72.12	 and(mark(X1),X2) -> mark(and(X1,X2))
283.05/72.12	 isNePal(mark(X)) -> mark(isNePal(X))
283.05/72.12	 proper(__(X1,X2)) -> __(proper(X1),proper(X2))
283.05/72.12	 proper(nil()) -> ok(nil())
283.05/72.12	 proper(and(X1,X2)) -> and(proper(X1),proper(X2))
283.05/72.12	 proper(tt()) -> ok(tt())
283.05/72.12	 proper(isNePal(X)) -> isNePal(proper(X))
283.05/72.12	 __(ok(X1),ok(X2)) -> ok(__(X1,X2))
283.05/72.12	 and(ok(X1),ok(X2)) -> ok(and(X1,X2))
283.05/72.12	 isNePal(ok(X)) -> ok(isNePal(X))
283.05/72.12	 top(mark(X)) -> top(proper(X))
283.05/72.12	 top(ok(X)) -> top(active(X))
283.05/72.12	
283.05/72.12	Proof:
283.05/72.12	 Open
283.05/72.13	EOF