018期：((02,04,13,14,17,19,20,21,23,28,31,32,37,39,44,45))开：23中中中
019期：((06,09,12,14,18,19,22,31,36,37,38,41,43,44,45,47))开：27错错错
020期：((05,06,09,14,16,19,23,25,31,36,37,38,39,40,43,47))开：16中中中
021期：((08,12,14,17,20,21,22,25,32,34,35,37,39,47,48,49))开：==？