a-a a-b a-c aaa aab aac aam aar aay ab- aba abb abc abm abr aby ac- aca acb acc acm acr acy ama amb amc amm amr amy ar- ara arb arc arm arr ary ay- aya ayc ayr baa bab bac bam bar bay bba bbb bbc bbm bbr bby bca bcb bcc bcm bcr bcy bma bmb bmc bmm bmr bra brb brm brr bry by- bya byc bym byr c-- caa cab cac cam car cay cba cbb cbc cbm cbr cby cca ccb ccc ccm ccr cma cmb cmc cmm cmr cmy cra crb crc crm crr cry cya cyb cyc cym cyr m-r maa mab mac mam mar may mba mbb mbc mbm mbr mc- mca mcb mcc mcm mcr mma mmb mmc mmm mmr mra mrb mrc mrm mrr mry my- mya myb myc mym myr ra- raa rab rac ram rar ray rba rbb rbc rbm rbr rca rcb rcc rcm rcr rma rmb rmc rmm rmr rra rrb rrc rrm rrr ry- rya ryc rym ryr ryy yaa yab yac yam yar yay ybc ybm ybr yby yca ycc ycy yma ymc ymm yra yrc yyb yyc yyy