1 =>a{2,3} 2 a 3 aa 4 aaa 5 aaaa 6 =>ba{2,3}c 7 bac 8 baac 9 baaac 10 baaaac 11 =>a(b|c){2,3}d 12 abcd 13 acccd 14 abd 15 accccd 16
