a-a a-b aaa aab aah aam aao aar ab- aba abb abh abm abo abr aha ahb ahh ahm aho ahr ama amb amh amm amo amr aoa aob aoh aom aoo aor ar- ara arb arh arm aro arr baa bab bah bam bao bar bba bbb bbh bbm bbo bbr bha bhb bhh bhm bho bhr bma bmb bmh bmm bmo bmr boa bob boh bom boo bor bra brb brh brm bro brr haa hab hah ham hao har hba hbb hbh hbm hbo hbr hha hhb hhh hhm hho hhr hma hmb hmh hmm hmo hmr hoa hob hoh hom hoo hor hr- hra hrb hrh hrm hro hrr m-o m-r maa mab mah mam mao mar mba mbb mbh mbm mbo mbr mha mhh mhm mho mhr mma mmb mmh mmm mmo mmr moa mob moh mom moo mor mra mrb mrh mrm mro mrr oaa oab oah oam oao oar ob- oba obb obh obm obo obr oha ohh ohm oho ohr om- oma omb omh omm omo omr oo- ooa oob ooh oom ooo oor or- ora orb orh orm oro orr ra- raa rab rah ram rao rar rba rbb rbh rbm rbo rbr rh- rha rhb rhh rhm rho rhr rma rmb rmh rmm rmo rmr roa rob roh rom roo ror rra rrb rrh rrm rrr