a-a a-b a-c aaa aab aac aae aah aam aao ab- aba abb abc abe abh abm abo ac- aca acb acc ace ach acm aco aea aeb aec aee aeh aem aeo aha ahb ahc ahe ahh ahm aho ama amb amc ame amh amm amo aoa aob aoc aoe aoh aom aoo baa bab bac bae bah bam bao bba bbb bbc bbe bbh bbm bbo bca bcb bcc bce bch bcm bco be- bea beb bec bee beh bem beo bha bhb bhc bhe bhh bhm bho bma bmb bmc bme bmh bmm bmo boa bob boc boe boh bom boo c-- caa cab cac cae cah cam cao cba cbb cbc cbe cbh cbm cbo cca ccb ccc cce cch ccm cco ce- cea ceb cec cee ceh cem ceo ch- cha chb chc che chh chm cho cma cmb cmc cme cmh cmm cmo co- coa cob coc coe coh com coo eaa eab eac eae eah eam eao eba ebb ebc ebe ebh ebm ebo ec- eca ecb ecc ece ech ecm eco eea eeb eec eee eem eeo eha ehb ehc ehe ehh ehm eho em- ema emb emc eme emh emm emo eo- eoa eob eoc eoe eoh eom eoo haa hab hac hae hah ham hao hba hbb hbc hbe hbh hbm hbo hca hcb hcc hce hch hcm hco he- hea heb hec hee heh hem heo hha hhb hhc hhe hhh hhm hho hma hmb hmc hme hmh hmm hmo hoa hob hoc hoe hoh hom hoo m-o maa mab mac mae mah mam mao mba mbb mbc mbe mbh mbm mbo mc- mca mcb mcc mce mch mcm mco mea meb mec mee meh mem meo mha mhc mhh mhm mho mma mmb mmc mme mmh mmm mmo moa mob moc moe moh mom moo oaa oab oac oae oah oam oao ob- oba obb obc obe obh obm obo oc- oca ocb occ och ocm oco oea oeb oec oee oeh oem oeo oha ohc ohe ohh ohm oho om- oma omb omc ome omh omm omo oo- ooa oob ooc ooh oom ooo