属于这两组的第一个数字：
121,323,345,1210,1212,1234,2123,3212,21212,34543,34565,54321,54343,54545,54567,87876,87898,89878,234321,234343,234545,234567,323432,323454,343232,343434,343456,432321,432343,434321,434323,434345,454323,543210,543234,898987,989876,989898,1010123,1012101,1210101,2123432,2123454,2323232,2323434,2323456,2343210,2343234,3456543,3456565,3456767,3456789,4321232,4323210,4323234,4343212,5454543,5454565,5456545,5456567,5654343,5654545,5654567,6767876,6767898,6787654,6787676,6787878,7654321,7654345,8767654,8767676,8767878,8787656,8787678,10101212,10121010,12101010,12121012,21010101,23454543,23454565,23456545,23456567,32101012,32345654,32345676,34345432,34345454,34345656,34345678,34543432,34543454,34545432,34545434,34545456,34565434,43434543,43434565,43454343,43454545,43454567,45434343,45434545,45434567,45454321,45454345,45654323,54343432,54343454,54345432,54345434,54345456,54543232,54543432,54543434,54543456,54545434,56543210,56543232,56543234,56543434,65432343,65434321,65434345,65454323,67878987,67898765,67898787,67898989,76543212,76543234,76789876,76789898,78787876,78787898,78789878,78987654,78987676,78987878,87678987,87878765,87878787,87878989,87898767,87898789,89876765,89876787,89878767,89878789,98767876,98767898,98787654,98787676,98787878,98987654,98987656,98987678,101232321,101232343,101234321,101234323,101234345,121212321,121212343,121232121,121232321,121232323,121232345,121234323,123212121,123212321,123212323,123212345,123232121,123232123,123232323,123432101,123432123,210101010,210121012,212101012,212345654,212345676,232345432,232345454,232345656,232345678,234343432,234343454,234345432,234345434,234345456,234543232,234543432,234543434,234543456,234545434,321012321,321012343,321212121,321212321,321212323,321212345,321232121,321232123,321232323,323210121,323212121,323212123,323212323,323232101,323232123,343210121,343210123,343212101,343212123,345456765,345456787,345656543,345656565,345656767,345656789,345676543,345676545,345676567,432343432,432343454,432345432,432345434,432345456,434323432,434323454,434343232,434343432,434343434,434343456,434345434,434543210,434543232,434543234,434543434,454323232,454323432,454323434,454323456,454343210,454343232,454343234,454343434,454543212,454543234,456787876,456787898,456789878,543210101,543210123,543456765,543456787,545456543,545456565,545456767,545456789,545654543,545654565,545656543,545656545,545656567,545676545,565454543,565454565,565456543,565456545,565456567,565654343,565654543,565654545,565654567,565656545,567654321. 一些较大的示例：
876787656,878765454,878765654,878765656,878765678,878767656,898765432,898765454,898765456,898765656,987878987,987898765,987898787,987898989,989878765,989878787,989878989,989898765,989898767,989898789.