0000, 1111, 2222, 33333, 4444, 55555, 6666, 7777, 88888, 9999
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, ...
111, 2222, 3333, 44444, 55555
10000
0.999999999999999, 0.9999999
