MAYBE
40.82/10.82	MAYBE
40.82/10.82	
40.82/10.82	Problem:
40.82/10.82	 a__f(X) -> a__if(mark(X),c(),f(true()))
40.82/10.82	 a__if(true(),X,Y) -> mark(X)
40.82/10.82	 a__if(false(),X,Y) -> mark(Y)
40.82/10.82	 mark(f(X)) -> a__f(mark(X))
40.82/10.82	 mark(if(X1,X2,X3)) -> a__if(mark(X1),mark(X2),X3)
40.82/10.82	 mark(c()) -> c()
40.82/10.82	 mark(true()) -> true()
40.82/10.82	 mark(false()) -> false()
40.82/10.82	 a__f(X) -> f(X)
40.82/10.82	 a__if(X1,X2,X3) -> if(X1,X2,X3)
40.82/10.82	
40.82/10.82	Proof:
40.82/10.82	 Open
40.82/10.82	EOF