一段-- 01,02,03,04,05,06,07 二段-- 08,09,10,11,12,13,14 三段-- 15,16,17,18,19,20,21 四段-- 22,23,24,25,26,27,28 五段-- 29,30,31,32,33,34,35 六段-- 36,37,38,39,40,41,42 七段-- 43,44,45,46,47,48,49