a-a a-b a-c aaa aab aac aae aaf aah aam aao ab- aba abb abc abe abf abh abm abo ac- aca acb acc ace acf ach acm aco aea aeb aec aee aef aeh aem aeo af- afa afb afc afe aff afh afm afo aha ahb ahc ahe ahf ahh ahm aho ama amb amc ame amf amh amm amo aoa aob aoc aoe aof aoh aom aoo baa bab bac bae baf bah bam bao bba bbb bbc bbe bbf bbh bbm bbo bca bcb bcc bce bcf bch bcm bco be- bea beb bec bee bef beh bem beo bfa bfb bfc bfe bff bfh bfm bfo bha bhb bhc bhe bhf bhh bhm bho bma bmb bmc bme bmf bmh bmm bmo boa bob boc boe bof boh bom boo c-- caa cab cac cae caf cah cam cao cba cbb cbc cbe cbf cbh cbm cbo cca ccb ccc cce ccf cch ccm cco ce- cea ceb cec cee cef ceh cem ceo cfa cfb cfc cfe cff cfh cfm cfo ch- cha chb chc che chf chh chm cho cma cmb cmc cme cmf cmh cmm cmo co- coa cob coc coe cof coh com coo eaa eab eac eae eaf eah eam eao eba ebb ebc ebe ebf ebh ebm ebo ec- eca ecb ecc ece ecf ech ecm eco eea eeb eec eee eef eem eeo ef- efa efb efc efe eff efh efm efo eha ehb ehc ehe ehf ehh ehm eho em- ema emb emc eme emf emh emm emo eo- eoa eob eoc eoe eof eoh eom eoo faa fab fac fae faf fah fam fao fba fbb fbc fbe fbf fbh fbm fbo fca fcb fcc fce fcf fcm fco fea feb fec fee fef feh fem feo ffa ffc ffe fff ffh ffm ffo fha fhb fhc fhe fhf fhh fhm fho fma fmb fmc fme fmf fmh fmm fmo foa fob foc foe fof foh fom foo haa hab hac hae haf hah ham hao hba hbb hbc hbe hbf hbh hbm hbo hca hcb hcc hce hcf hch hcm hco he- hea heb hec hee hef heh hem heo hfa hfb hfc hfe hff hfh hfm hfo hha hhb hhc hhe hhf hhh hhm hho hma hmb hmc hme hmf hmh hmm hmo hoa hob hoc hoe hof hoh hom hoo m-f m-o maa mab mac mae maf mah mam mao mba mbb mbc mbe mbf mbh mbm mbo mc- mca mcb mcc mce mcf mch mcm mco mea meb mec mee mef meh mem meo mfa mfb mfc mfe mff mfh mfm mfo mha mhc mhf mhh mhm mho mma mmb mmc mme mmf mmh mmm mmo moa mob moc moe mof moh mom moo oaa oab oac oae oaf oah oam oao ob- oba obb obc obe obf obh obm obo oc- oca ocb occ ocf och ocm oco oea oeb oec oee oef oeh oem oeo of- ofa ofb ofc ofe off ofm ofo oha ohc ohe ohf ohh ohm oho om- oma omb omc ome omf omh omm omo oo- ooa oob ooc oof ooh oom ooo