020期：16码≤≤05,07,08,12,16,18,23,26,27,30,38,41,42,44,45,47≥≥开：16对
021期：16码≤≤01,03,05,16,17,18,20,22,23,26,35,36,38,41,48,49≥≥开：39错
022期：16码≤≤04,15,16,19,20,21,24,27,31,33,34,35,36,37,38,39≥≥开：40错
023期：16码≤≤04,07,09,13,16,18,20,22,23,24,28,29,30,37,39,42≥≥开：//