a-a a-b aaa aab aah aam aao aax ab- aba abb abh abm abo abx aha ahb ahh ahm aho ahx ama amb amh amm amo amx aoa aob aoh aom aoo aox ax- axa axh axm axo axx baa bab bah bam bao bax bba bbb bbh bbm bbo bbx bha bhb bhh bhm bho bhx bma bmb bmh bmm bmo bmx boa bob boh bom boo box bxb bxm bxo bxx haa hab hah ham hao hax hba hbb hbh hbm hbo hbx hha hhb hhh hhm hho hma hmb hmh hmm hmo hmx hoa hob hoh hom hoo hox hxm m-o maa mab mah mam mao max mba mbb mbh mbm mbo mbx mha mhh mhm mho mhx mma mmb mmh mmm mmo mmx moa mob moh mom moo mox mxa oaa oab oah oam oao oax ob- oba obb obh obm obo obx oha ohh ohm oho om- oma omb omh omm omo omx oo- ooa oob ooh oom ooo oox ox- oxa oxb oxo oxx xaa xam xbx xma xmh xmm xmo xmx xoa xom xoo xox xxo xxx