MAYBE
25.20/10.18	MAYBE
25.20/10.18	
25.20/10.18	Problem:
25.20/10.18	 plus(s(X),plus(Y,Z)) -> plus(X,plus(s(s(Y)),Z))
25.20/10.18	 plus(s(X1),plus(X2,plus(X3,X4))) -> plus(X1,plus(X3,plus(X2,X4)))
25.20/10.18	
25.20/10.18	Proof:
25.20/10.18	 Open
25.20/10.19	EOF