18 ad 19 abc 判断:
1 a 2 a 3 b 4 b 5 a 6 b 7 b 8 b 9 b 10 a 11 a 12 b 13 a 14 a 15 a 16 b 17 b
26
18 a 19 b 20 b 21 a 22 a 23 b 24 b 25 a 26 b 27 a 28 b 29 a
27
18 ad 19 abc 判断:
1 a 2 a 3 b 4 b 5 a 6 b 7 b 8 b 9 b 10 a 11 a 12 b 13 a 14 a 15 a 16 b 17 b
26
18 a 19 b 20 b 21 a 22 a 23 b 24 b 25 a 26 b 27 a 28 b 29 a
27