a-a a-b a-c aaa aab aac aah aam aan aao ab- aba abb abc abh abm abn abo ac- aca acb acc ach acm acn aco aha ahb ahc ahh ahm ahn aho ama amb amc amh amm amn amo an- ana anb anc anh anm ann ano aoa aob aoc aoh aom aon aoo baa bab bac bah bam ban bao bba bbb bbc bbh bbm bbn bbo bca bcb bcc bch bcm bcn bco bha bhb bhc bhh bhm bho bma bmb bmc bmh bmm bmn bmo bna bnb bnc bnn bno boa bob boc boh bom bon boo c-- caa cab cac cah cam can cao cba cbb cbc cbh cbm cbn cbo cca ccb ccc cch ccm ccn cco ch- cha chb chc chh chm chn cho cma cmb cmc cmh cmm cmn cmo cn- cna cnb cnc cnh cnm cnn cno co- coa cob coc coh com con coo haa hab hac hah ham han hao hba hbb hbc hbh hbm hbn hbo hca hcb hcc hch hcm hcn hco hha hhb hhc hhh hhm hhn hho hma hmb hmc hmh hmm hmo hna hnb hnc hnh hnn hno hoa hob hoc hoh hom hon hoo m-o maa mab mac mah mam man mao mba mbb mbc mbh mbm mbo mc- mca mcb mcc mch mcm mcn mco mha mhc mhh mhm mhn mho mma mmb mmc mmh mmm mmn mmo mna mnb mnc mnm mnn mno moa mob moc moh mom mon moo naa nab nac nah nam nan nao nba nbb nbc nbm nbn nbo nca ncb ncc nch ncm ncn nco nha nhb nhc nhh nhm nhn nma nmb nmc nmh nmm nmn nmo nna nnb nnc nnh nnm nnn nno no- noa nob noc noh nom non noo oaa oab oac oah oam oan oao ob- oba obb obc obh obm obn obo oc- oca ocb occ och ocm ocn oco oha ohc ohh ohm ohn oho om- oma omb omc omh omm omn omo on- ona onb onc onh onn ono oo- ooa oob ooc ooh oom oon ooo