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1245678, 1245679, 1245689, 1245789, 1246789, 1256789, 1345678, 1345679, 1345789, 1346789, 1356789, 1456789, 2345678, 2345679, 2345689, 2345789, 2346789, 2356789, 2456789, 3456789.