251期：←24码→（03,04,06,07,10,12,13,14,16,20,23,26,30,31,32,34,35,36,37,40,44,45,46,49）开：13准
252期：←24码→（02,03,04,06,13,15,17,18,19,23,25,27,28,29,30,33,35,37,39,41,43,44,45,49）开：08错
253期：←24码→（03,06,09,10,11,12,13,14,15,19,20,21,22,26,28,29,31,32,33,35,37,38,42,45）开：09准
254期：←24码→（01,05,06,07,08,13,15,16,18,19,20,22,26,28,30,31,33,36,41,43,46,47,48,49）开：？？