201.27/50.33	MAYBE
201.27/50.33	
201.27/50.33	Problem:
201.27/50.33	 a(a(a(x1))) -> b(b(c(c(x1))))
201.27/50.33	 c(b(x1)) -> a(a(c(x1)))
201.27/50.33	
201.27/50.33	Proof:
201.27/50.33	 Open
201.35/50.33	EOF