a-a a-b a-c aaa aab aac aae aah aak aam aao ab- aba abb abc abe abh abk abm abo ac- aca acb acc ace ach ack acm aco aea aeb aec aee aeh aek aem aeo aha ahb ahc ahe ahh ahk ahm aho aka akb akc ake akh akk akm ako ama amb amc ame amh amk amm amo aoa aob aoc aoe aoh aok aom aoo baa bab bac bae bah bak bam bao bba bbb bbc bbe bbh bbk bbm bbo bca bcb bcc bce bch bck bcm bco be- bea beb bec bee beh bek bem beo bha bhb bhc bhe bhh bhk bhm bho bka bkb bkc bke bkk bkm bko bma bmb bmc bme bmh bmk bmm bmo boa bob boc boe boh bok bom boo c-- caa cab cac cae cah cak cam cao cba cbb cbc cbe cbh cbk cbm cbo cca ccb ccc cce cch cck ccm cco ce- cea ceb cec cee ceh cek cem ceo ch- cha chb chc che chh chk chm cho cka ckb ckc ckh ckm cko cma cmb cmc cme cmh cmk cmm cmo co- coa cob coc coe coh cok com coo eaa eab eac eae eah eak eam eao eba ebb ebc ebe ebh ebk ebm ebo ec- eca ecb ecc ece ech eck ecm eco eea eeb eec eee eek eem eeo eha ehb ehc ehe ehh ehm eho eka ekb ekc eke ekh eko em- ema emb emc eme emh emk emm emo eo- eoa eob eoc eoe eoh eok eom eoo haa hab hac hae hah hak ham hao hba hbb hbc hbe hbh hbk hbm hbo hca hcb hcc hce hch hck hcm hco he- hea heb hec hee heh hek hem heo hha hhb hhc hhe hhh hhk hhm hho hka hkb hkh hkk hkm hko hma hmb hmc hme hmh hmk hmm hmo hoa hob hoc hoe hoh hok hom hoo ka- kaa kab kac kae kah kak kam kao kba kbb kbc kbe kbh kbk kbm kbo kca kcb kcc kce kch kck kcm ke- kea keb kec kee keh kek kem keo kha khe khh khk khm kho kkb kkc kke kkh kkk kkm kma kmb kmc kme kmh kmk kmm kmo koa kob koc koe koh kok kom koo m-o maa mab mac mae mah mak mam mao mba mbb mbc mbe mbh mbk mbm mbo mc- mca mcb mcc mce mch mck mcm mco mea meb mec mee meh mek mem meo mha mhc mhh mhk mhm mho mka mkb mkc mke mkh mkk mkm mko mma mmb mmc mme mmh mmk mmm mmo moa mob moc moe moh mok mom moo oaa oab oac oae oah oak oam oao ob- oba obb obc obe obh obk obm obo oc- oca ocb occ och ock ocm oco oea oeb oec oee oeh oem oeo oha ohc ohe ohh ohm oho oka okb okc oke okk oko om- oma omb omc ome omh omm omo oo- ooa oob ooc ooh ook oom ooo