277期：<<02,05,06,07,08,13,14,16,22,24,30,32,34,39,41,47>>开：16中中中
278期：<<02,05,06,08,09,11,15,21,22,25,29,33,35,40,47,48>>开：28错错错
279期：<<02,10,11,15,16,17,18,19,32,39,40,43,44,45,48,49>>开：27错错错
280期：<<01,02,04,05,06,08,09,12,19,21,23,30,31,38,39,48>>开：中？