a-a a-b a-c aaa aab aac aak aam aar aay ab- aba abb abc abk abm abr aby ac- aca acb acc ack acm acr acy aka akb akc akk akm akr ama amb amc amk amm amr amy ar- ara arb arc ark arm arr ary ay- aya ayc ayk ayr baa bab bac bak bam bar bay bba bbb bbc bbk bbm bbr bby bca bcb bcc bck bcm bcr bcy bka bkb bkc bkk bkm bkr bma bmb bmc bmk bmm bmr bra brb brk brm brr bry by- bya byc byk bym byr c-- caa cab cac cak cam car cay cba cbb cbc cbk cbm cbr cby cca ccb ccc cck ccm ccr cka ckb ckc ckm cky cma cmb cmc cmk cmm cmr cmy cra crb crc crk crm crr cry cya cyb cyc cyk cym cyr ka- kaa kab kac kak kam kar kay kba kbb kbc kbk kbm kbr kca kcb kcc kck kcm kcr kkb kkc kkk kkm kkr kky kma kmb kmc kmk kmm kra krc krk krr kry kya kyc kym kyr m-r maa mab mac mak mam mar may mba mbb mbc mbk mbm mbr mc- mca mcb mcc mck mcm mcr mka mkb mkc mkk mkm mkr mky mma mmb mmc mmk mmm mmr mra mrb mrc mrk mrm mrr mry my- mya myb myc myk mym myr ra- raa rab rac rak ram rar ray rba rbb rbc rbk rbm rbr rca rcb rcc rcm rcr rkb rkc rkk rkm rky rma rmb rmc rmm rmr rra rrb rrc rrk rrm rrr ry- rya ryc ryk rym ryr ryy yaa yab yac yak yam yar yay ybc ybm ybr yby yca ycc ycy yka ykk ykm yma ymc ymm yra yrc yyb yyc yyy