1# 2# Tests a[ab]* 3# 4t 0 1 a 5t 1 1 a 6t 1 1 b 7f 1 8------- 9a 10=> 11a 12a 13=> 14a 15b 16a 17b 18a 19b 20=> 21b 22=> 23a 24c 25=> 26=> 27