MAYBE
202.06/61.45	MAYBE
202.06/61.45	
202.06/61.45	Problem:
202.06/61.45	 b(c(a(x1))) -> a(b(x1))
202.06/61.45	 b(b(b(x1))) -> c(a(c(x1)))
202.06/61.45	 c(d(x1)) -> d(c(x1))
202.06/61.45	 c(d(b(x1))) -> d(c(c(x1)))
202.06/61.45	 d(c(x1)) -> b(b(b(x1)))
202.06/61.45	 c(b(x1)) -> d(a(x1))
202.06/61.45	 d(b(c(x1))) -> a(a(x1))
202.06/61.45	 d(a(x1)) -> b(x1)
202.06/61.45	
202.06/61.45	Proof:
202.06/61.45	 Open
202.06/61.45	EOF