matching cost = 4 s a d f a s d : 0 0 0 0 0 0 0 0 a: 0 1 1 2 3 4 5 6 f: 0 2 2 2 2 3 4 5 d: 0 3 3 2 3 3 4 4 s: 0 3 4 3 3 4 3 4 d: 0 4 4 4 4 4 4 3 f: 0 5 5 5 4 5 5 4 s a d f a s d : 0 0 0 0 0 0 0 0 a: 0 0 0 0 0 0 0 0 f: 0 0 0 0 0 0 0 0 d: 0 0 0 0 0 0 0 0 s: 0 0 0 0 0 0 0 0 d: 0 0 0 0 0 0 0 0 f: 0 0 0 0 0 0 0 0 6 7 SMSSSSS