a-a a-b a-c aaa aab aac aah aak aam aao aar ab- aba abb abc abh abk abm abo abr ac- aca acb acc ach ack acm aco acr aha ahb ahc ahh ahk ahm aho ahr aka akb akc akh akk akm ako akr ama amb amc amh amk amm amo amr aoa aob aoc aoh aok aom aoo aor ar- ara arb arc arh ark arm aro arr baa bab bac bah bak bam bao bar bba bbb bbc bbh bbk bbm bbo bbr bca bcb bcc bch bck bcm bco bcr bha bhb bhc bhh bhk bhm bho bhr bka bkb bkc bkk bkm bko bkr bma bmb bmc bmh bmk bmm bmo bmr boa bob boc boh bok bom boo bor bra brb brh brk brm bro brr c-- caa cab cac cah cak cam cao car cba cbb cbc cbh cbk cbm cbo cbr cca ccb ccc cch cck ccm cco ccr ch- cha chb chc chh chk chm cho chr cka ckb ckc ckh ckm cko cma cmb cmc cmh cmk cmm cmo cmr co- coa cob coc coh cok com coo cor cra crb crc crh crk crm cro crr haa hab hac hah hak ham hao har hba hbb hbc hbh hbk hbm hbo hbr hca hcb hcc hch hck hcm hco hcr hha hhb hhc hhh hhk hhm hho hhr hka hkb hkh hkk hkm hko hkr hma hmb hmc hmh hmk hmm hmo hmr hoa hob hoc hoh hok hom hoo hor hr- hra hrb hrc hrh hrk hrm hro hrr ka- kaa kab kac kah kak kam kao kar kba kbb kbc kbh kbk kbm kbo kbr kca kcb kcc kch kck kcm kcr kha khh khk khm kho khr kkb kkc kkh kkk kkm kkr kma kmb kmc kmh kmk kmm kmo koa kob koc koh kok kom koo kor kra krc krk kro krr m-o m-r maa mab mac mah mak mam mao mar mba mbb mbc mbh mbk mbm mbo mbr mc- mca mcb mcc mch mck mcm mco mcr mha mhc mhh mhk mhm mho mhr mka mkb mkc mkh mkk mkm mko mkr mma mmb mmc mmh mmk mmm mmo mmr moa mob moc moh mok mom moo mor mra mrb mrc mrh mrk mrm mro mrr oaa oab oac oah oak oam oao oar ob- oba obb obc obh obk obm obo obr oc- oca ocb occ och ock ocm oco ocr oha ohc ohh ohm oho ohr oka okb okc okk oko okr om- oma omb omc omh omm omo omr oo- ooa oob ooc ooh ook oom ooo oor or- ora orb orc orh ork orm oro orr ra- raa rab rac rah rak ram rao rar rba rbb rbc rbh rbk rbm rbo rbr rca rcb rcc rch rcm rco rcr rh- rha rhb rhc rhh rhm rho rhr rkb rkc rkk rkm rko rma rmb rmc rmh rmm rmo rmr roa rob roc roh rok rom roo ror rra rrb rrc rrh rrk rrm rrr