a-a a-b a-c aaa aab aac aam aan aao aar aay ab- aba abb abc abm abn abo abr aby ac- aca acb acc acm acn aco acr acy ama amb amc amm amn amo amr amy an- ana anb anc anm ann ano anr any aoa aob aoc aom aon aoo aor ar- ara arb arc arm arn aro arr ary ay- aya ayc ayn ayo ayr baa bab bac bam ban bao bar bay bba bbb bbc bbm bbn bbo bbr bby bca bcb bcc bcm bcn bco bcr bcy bma bmb bmc bmm bmn bmo bmr bna bnb bnc bnn bno bnr boa bob boc bom bon boo bor boy bra brb brm brn bro brr bry by- bya byc bym byn byo byr c-- caa cab cac cam can cao car cay cba cbb cbc cbm cbn cbo cbr cby cca ccb ccc ccm ccn cco ccr cma cmb cmc cmm cmn cmo cmr cmy cn- cna cnb cnc cnm cnn cno cnr cny co- coa cob coc com con coo cor coy cra crb crc crm crn cro crr cry cya cyb cyc cym cyn cyo cyr m-o m-r maa mab mac mam man mao mar may mba mbb mbc mbm mbo mbr mc- mca mcb mcc mcm mcn mco mcr mma mmb mmc mmm mmn mmo mmr mna mnb mnc mnm mnn mno mnr moa mob moc mom mon moo mor moy mra mrb mrc mrm mrn mro mrr mry my- mya myb myc mym myn myo myr naa nab nac nam nan nao nar nay nba nbb nbc nbm nbn nbo nbr nca ncb ncc ncm ncn nco ncr nma nmb nmc nmm nmn nmo nmr nna nnb nnc nnm nnn nno no- noa nob noc nom non noo nor noy nra nrb nrc nrm nrn nro nrr nry nya nyc nym nyn nyo nyy oaa oab oac oam oan oao oar ob- oba obb obc obm obn obo obr oby oc- oca ocb occ ocm ocn oco ocr om- oma omb omc omm omn omo omr omy on- ona onb onc onn ono onr ony oo- ooa oob ooc oom oon ooo oor or- ora orb orc orm orn oro orr ory oya oyo ra- raa rab rac ram ran rao rar ray rba rbb rbc rbm rbn rbo rbr rca rcb rcc rcm rcn rco rcr rma rmb rmc rmm rmn rmo rmr rna rnb rnc rnm rnn rno rnr rny roa rob roc rom ron roo ror roy rra rrb rrc rrm rrn rrr ry- rya ryc rym ryn ryo ryr ryy yaa yab yac yam yan yao yar yay ybc ybm ybr yby yca ycc yco ycy yma ymc ymm ymo yna ynn yny yob yoc yom yon yoo yor yoy yra yrc yrn yro yyb yyc yyy