MAYBE
170.53/55.60	MAYBE
170.53/55.60	
170.53/55.60	Problem:
170.53/55.60	 a(c(b(b(x1)))) -> b(b(b(c(x1))))
170.53/55.60	 b(b(c(x1))) -> b(a(b(b(x1))))
170.53/55.60	 c(a(a(a(x1)))) -> a(c(x1))
170.53/55.60	 b(b(b(x1))) -> c(b(a(c(x1))))
170.53/55.60	
170.53/55.60	Proof:
170.53/55.60	 Open
170.53/55.61	EOF