280期：≌【24】≌《01,09,11,12,13,15,16,20,21,23,24,28,31,34,36,38,39,41,42,43,44,45,46,48》开：15对
281期：≌【24】≌《04,05,08,09,12,14,15,16,19,20,21,22,24,27,28,31,32,37,39,40,42,43,44,49》开：10错
282期：≌【24】≌《08,09,11,12,13,14,15,19,21,25,28,30,32,33,35,38,40,41,42,43,44,45,46,48》开：23错
283期：≌【24】≌《02,04,11,13,15,17,18,25,27,28,29,32,33,34,38,39,40,41,42,43,45,46,47,49》开：18对
284期：≌【24】≌《03,04,05,06,07,08,10,11,12,14,15,23,28,33,34,35,40,41,42,43,44,45,48,49》开：//