MAYBE
246.92/62.66	MAYBE
246.92/62.66	
246.92/62.66	Problem:
246.92/62.66	 active(__(__(X,Y),Z)) -> mark(__(X,__(Y,Z)))
246.92/62.66	 active(__(X,nil())) -> mark(X)
246.92/62.66	 active(__(nil(),X)) -> mark(X)
246.92/62.66	 active(U11(tt())) -> mark(U12(tt()))
246.92/62.66	 active(U12(tt())) -> mark(tt())
246.92/62.66	 active(isNePal(__(I,__(P,I)))) -> mark(U11(tt()))
246.92/62.66	 mark(__(X1,X2)) -> active(__(mark(X1),mark(X2)))
246.92/62.66	 mark(nil()) -> active(nil())
246.92/62.66	 mark(U11(X)) -> active(U11(mark(X)))
246.92/62.66	 mark(tt()) -> active(tt())
246.92/62.66	 mark(U12(X)) -> active(U12(mark(X)))
246.92/62.66	 mark(isNePal(X)) -> active(isNePal(mark(X)))
246.92/62.66	 __(mark(X1),X2) -> __(X1,X2)
246.92/62.66	 __(X1,mark(X2)) -> __(X1,X2)
246.92/62.66	 __(active(X1),X2) -> __(X1,X2)
246.92/62.66	 __(X1,active(X2)) -> __(X1,X2)
246.92/62.66	 U11(mark(X)) -> U11(X)
246.92/62.66	 U11(active(X)) -> U11(X)
246.92/62.66	 U12(mark(X)) -> U12(X)
246.92/62.66	 U12(active(X)) -> U12(X)
246.92/62.66	 isNePal(mark(X)) -> isNePal(X)
246.92/62.66	 isNePal(active(X)) -> isNePal(X)
246.92/62.66	
246.92/62.66	Proof:
246.92/62.66	 Open
246.92/62.66	EOF