5. Which of the following languages are regular? Prove your answer.

(1). {0 m1 n0 m+n : m 1, n 1}.

(2). {0 m0 n0 m+n : m 1, n 1}.

(3). {xwxR : x (0 + 1) , w (0 + 1)}.

(4). {0 n1 m : n 1, m 1, n > m}