020期：→№←【03,05,07,10,12,13,16,18,23,24,28,29,30,31,33,34,35,36,41,43,44,45,48,49】开：16对
021期：→№←【01,02,03,06,07,09,11,15,17,19,20,21,22,23,27,28,29,30,31,32,41,43,46,49】开：39错
022期：→№←【03,04,05,06,07,12,13,15,20,21,22,23,27,29,30,31,32,33,36,38,41,42,46,48】开：40错
023期：→№←【01,03,04,05,08,12,16,18,20,21,22,25,26,28,30,31,33,35,37,38,40,41,44,47】开：**