a-a a-b a-c aaa aab aac aae aak aam aao aav ab- aba abb abc abe abk abm abo abv ac- aca acb acc ace ack acm aco acv aea aeb aec aee aek aem aeo aev aka akb akc ake akk akm ako akv ama amb amc ame amk amm amo amv aoa aob aoc aoe aok aom aoo aov av- ava avb avc ave avk avm avo baa bab bac bae bak bam bao bav bba bbb bbc bbe bbk bbm bbo bca bcb bcc bce bck bcm bco bcv be- bea beb bec bee bek bem beo bev bka bkb bkc bke bkk bkm bko bkv bma bmb bmc bme bmk bmm bmo bmv boa bob boc boe bok bom boo bov bva bvb bvc bve bvk bvm bvo bvv c-- caa cab cac cae cak cam cao cav cba cbb cbc cbe cbk cbm cbo cbv cca ccb ccc cce cck ccm cco ccv ce- cea ceb cec cee cek cem ceo cev cka ckb ckc ckm cko cma cmb cmc cme cmk cmm cmo cmv co- coa cob coc coe cok com coo cov cva cvb cvc cve cvk cvm cvo cvv eaa eab eac eae eak eam eao eav eba ebb ebc ebe ebk ebm ebo ebv ec- eca ecb ecc ece eck ecm eco ecv eea eeb eec eee eek eem eeo eev eka ekb ekc eke eko ekv em- ema emb emc eme emk emm emo emv eo- eoa eob eoc eoe eok eom eoo eva evb evc eve evm evo evv ka- kaa kab kac kae kak kam kao kav kba kbb kbc kbe kbk kbm kbo kca kcb kcc kce kck kcm ke- kea keb kec kee kek kem keo kev kkb kkc kke kkk kkm kkv kma kmb kmc kme kmk kmm kmo koa kob koc koe kok kom koo kva kvb kvk kvm kvo kvv m-o m-v maa mab mac mae mak mam mao mav mba mbb mbc mbe mbk mbm mbo mbv mc- mca mcb mcc mce mck mcm mco mcv mea meb mec mee mek mem meo mev mka mkb mkc mke mkk mkm mko mkv mma mmb mmc mme mmk mmm mmo mmv moa mob moc moe mok mom moo mov mva mvb mvc mve mvm mvo mvv oaa oab oac oae oak oam oao oav ob- oba obb obc obe obk obm obo obv oc- oca ocb occ ock ocm oco ocv oea oeb oec oee oem oeo oka okb okc oke okk oko om- oma omb omc ome omm omo omv oo- ooa oob ooc ook oom ooo oov ov- ova ovb ovc ove ovo ovv v-a v-e vaa vab vac vae vak vam vao vav vba vbc vbk vbm vbo vbv vca vcc vce vcm vco vea veb vec vee vek vem veo vka vkb vkm vm- vma vmc vmm vmo voa vob voc voe vok vom voo vov vva vvb vvc vvm vvo vvv