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1.1 misho 1: =>(a|b{0,3}){0,1}
2: a
3: aa
4: b
5: bb
6: bbb
7: bbbb
8: ab
9: ba
10: =>([0-9]{0,3}|([0-9]{0}|[0-9]{0,3})){0,3}
11: 0
12: 00
13: 123
14: abc