a-a a-b a-c aaa aab aac aam aan aao aay ab- aba abb abc abm abn abo aby ac- aca acb acc acm acn aco acy ama amb amc amm amn amo amy an- ana anb anc anm ann ano any aoa aob aoc aom aon aoo ay- aya ayc ayn ayo baa bab bac bam ban bao bay bba bbb bbc bbm bbn bbo bby bca bcb bcc bcm bcn bco bcy bma bmb bmc bmm bmn bmo bna bnb bnc bnn bno boa bob boc bom bon boo boy by- bya byc bym byn byo c-- caa cab cac cam can cao cay cba cbb cbc cbm cbn cbo cby cca ccb ccc ccm ccn cco cma cmb cmc cmm cmn cmo cmy cn- cna cnb cnc cnm cnn cno cny co- coa cob coc com con coo coy cya cyb cyc cym cyn cyo m-o maa mab mac mam man mao may mba mbb mbc mbm mbo mc- mca mcb mcc mcm mcn mco mma mmb mmc mmm mmn mmo mna mnb mnc mnm mnn mno moa mob moc mom mon moo moy my- mya myb myc mym myn myo naa nab nac nam nan nao nay nba nbb nbc nbm nbn nbo nca ncb ncc ncm ncn nco nma nmb nmc nmm nmn nmo nna nnb nnc nnm nnn nno no- noa nob noc nom non noo noy nya nyc nym nyn nyo nyy oaa oab oac oam oan oao ob- oba obb obc obm obn obo oby oc- oca ocb occ ocm ocn oco om- oma omb omc omm omn omo omy on- ona onb onc onn ono ony oo- ooa oob ooc oom oon ooo oya oyo yaa yab yac yam yan yao yay ybc ybm yby yca ycc yco ycy yma ymc ymm ymo yna ynn yny yob yoc yom yon yoo yoy yyb yyc yyy