MAYBE
259.38/65.60	MAYBE
259.38/65.60	
259.38/65.60	Problem:
259.38/65.60	 rec(rec(x)) -> sent(rec(x))
259.38/65.60	 rec(sent(x)) -> sent(rec(x))
259.38/65.60	 rec(no(x)) -> sent(rec(x))
259.38/65.60	 rec(bot()) -> up(sent(bot()))
259.38/65.60	 rec(up(x)) -> up(rec(x))
259.38/65.60	 sent(up(x)) -> up(sent(x))
259.38/65.60	 no(up(x)) -> up(no(x))
259.38/65.60	 top(rec(up(x))) -> top(check(rec(x)))
259.38/65.60	 top(sent(up(x))) -> top(check(rec(x)))
259.38/65.60	 top(no(up(x))) -> top(check(rec(x)))
259.38/65.60	 check(up(x)) -> up(check(x))
259.38/65.60	 check(sent(x)) -> sent(check(x))
259.38/65.60	 check(rec(x)) -> rec(check(x))
259.38/65.60	 check(no(x)) -> no(check(x))
259.38/65.60	 check(no(x)) -> no(x)
259.38/65.60	
259.38/65.60	Proof:
259.38/65.60	 Open
259.38/65.61	EOF