a-a a-b a-c aaa aab aac aah aam aay ab- aba abb abc abh abm aby ac- aca acb acc ach acm acy aha ahb ahc ahh ahm ahy ama amb amc amh amm amy ay- aya ayc ayh baa bab bac bah bam bay bba bbb bbc bbh bbm bby bca bcb bcc bch bcm bcy bha bhb bhc bhh bhm bma bmb bmc bmh bmm by- bya byc byh bym c-- caa cab cac cah cam cay cba cbb cbc cbh cbm cby cca ccb ccc cch ccm ch- cha chb chc chh chm chy cma cmb cmc cmh cmm cmy cya cyb cyc cym haa hab hac hah ham hay hba hbb hbc hbh hbm hby hca hcb hcc hch hcm hcy hha hhb hhc hhh hhm hhy hma hmb hmc hmh hmm hmy hy- hya hyb hyc hyh hym hyy maa mab mac mah mam may mba mbb mbc mbh mbm mc- mca mcb mcc mch mcm mha mhc mhh mhm mma mmb mmc mmh mmm my- mya myb myc myh mym yaa yab yac yah yam yay ybc ybm yby yca ycc ych ycy yha yhc yma ymc ymm yyb yyc yyy