a-a a-b a-c aaa aab aac aah aam aao aar ab- aba abb abc abh abm abo abr ac- aca acb acc ach acm aco acr aha ahb ahc ahh ahm aho ahr ama amb amc amh amm amo amr aoa aob aoc aoh aom aoo aor ar- ara arb arc arh arm aro arr baa bab bac bah bam bao bar bba bbb bbc bbh bbm bbo bbr bca bcb bcc bch bcm bco bcr bha bhb bhc bhh bhm bho bhr bma bmb bmc bmh bmm bmo bmr boa bob boc boh bom boo bor bra brb brh brm bro brr c-- caa cab cac cah cam cao car cba cbb cbc cbh cbm cbo cbr cca ccb ccc cch ccm cco ccr ch- cha chb chc chh chm cho chr cma cmb cmc cmh cmm cmo cmr co- coa cob coc coh com coo cor cra crb crc crh crm cro crr haa hab hac hah ham hao har hba hbb hbc hbh hbm hbo hbr hca hcb hcc hch hcm hco hcr hha hhb hhc hhh hhm hho hhr hma hmb hmc hmh hmm hmo hmr hoa hob hoc hoh hom hoo hor hr- hra hrb hrc hrh hrm hro hrr m-o m-r maa mab mac mah mam mao mar mba mbb mbc mbh mbm mbo mbr mc- mca mcb mcc mch mcm mco mcr mha mhc mhh mhm mho mhr mma mmb mmc mmh mmm mmo mmr moa mob moc moh mom moo mor mra mrb mrc mrh mrm mro mrr oaa oab oac oah oam oao oar ob- oba obb obc obh obm obo obr oc- oca ocb occ och ocm oco ocr oha ohc ohh ohm oho ohr om- oma omb omc omh omm omo omr oo- ooa oob ooc ooh oom ooo oor or- ora orb orc orh orm oro orr ra- raa rab rac rah ram rao rar rba rbb rbc rbh rbm rbo rbr rca rcb rcc rch rcm rco rcr rh- rha rhb rhc rhh rhm rho rhr rma rmb rmc rmh rmm rmo rmr roa rob roc roh rom roo ror rra rrb rrc rrh rrm rrr