020期：→№←【01,05,12,14,15,16,18,19,22,23,27,30,31,32,33,35,38,40,41,42,43,45,47,49】开：12对
021期：→№←【05,07,09,10,15,16,18,19,21,23,25,26,29,31,32,33,36,37,39,40,41,43,44,45】开：42错
022期：→№←【03,04,05,08,10,12,15,16,17,19,21,22,23,24,25,31,32,34,36,38,41,42,47,48】开：18错
023期：→№←【03,04,05,06,08,09,10,15,16,18,20,23,24,25,29,30,35,38,41,42,44,46,48,49】开：**