18/4.
ĐB (6 4số)
01,03,04,05,07,08,11,12,13,14,
16,17,18,22,23,24,25,27,28,30,
31,32,33,35,37,38,39,40,41,42,
45,46,47,49,51,53,54,59,60,61,
62,64,66,67,69,70,72,73,74,76,
77,78,80,82,86,87,88,89,90,94,
96,97,98,99
Hạ dàn: (2 2 số)
08,12,17,18,28,30,31,32,35,37,
38,39,49,62,67,78,80,82,87,88...