a-a a-b a-c aaa aab aac aad aae aag aah aak aao ab- aba abb abc abd abe abg abh abk abo ac- aca acb acc acd ace acg ach ack aco ad- ada adb adc add ade adg adh adk ado aea aeb aec aed aee aeg aeh aek aeo ag- aga agb agc agd age agg agh agk ago aha ahb ahc ahd ahe ahg ahh ahk aho aka akb akc akd ake akg akh akk ako aoa aob aoc aod aoe aog aoh aok aoo baa bab bac bad bae bag bah bak bao bba bbb bbc bbd bbe bbg bbh bbk bbo bca bcb bcc bcd bce bcg bch bck bco bda bdb bdc bdd bde bdg bdh bdk bdo be- bea beb bec bed bee beg beh bek beo bga bgb bgc bgd bge bgg bgh bgk bgo bha bhb bhc bhd bhe bhg bhh bhk bho bka bkb bkc bke bkg bkk bko boa bob boc bod boe bog boh bok boo c-- caa cab cac cad cae cag cah cak cao cba cbb cbc cbd cbe cbg cbh cbk cbo cca ccb ccc ccd cce ccg cch cck cco cda cdb cdc cdd cde cdg cdh cdk cdo ce- cea ceb cec ced cee ceg ceh cek ceo cga cgb cgc cgd cge cgg cgh cgo ch- cha chb chc chd che chg chh chk cho cka ckb ckc ckd ckh cko co- coa cob coc cod coe cog coh cok coo daa dab dac dad dae dag dah dak dao dba dbb dbc dbd dbe dbg dbh dbk dbo dca dcb dcc dcd dce dcg dck dco dda ddb ddc ddd dde ddg ddh ddk ddo de- dea deb dec ded dee deg deh dek deo dga dgc dgd dge dgg dgh dgk dh- dha dhb dhc dhd dhe dhh dhk dho dka dkb dkc dke dkg dkk dko doa dob doc dod doe dog doh dok doo eaa eab eac ead eae eag eah eak eao eba ebb ebc ebd ebe ebg ebh ebk ebo ec- eca ecb ecc ecd ece ecg ech eck eco ed- eda edb edc edd ede edg edh edk edo eea eeb eec eed eee eeg eek eeo ega egb egc egd ege egg egh ego eha ehb ehc ehd ehe ehg ehh eho eka ekb ekc ekd eke ekg ekh eko eo- eoa eob eoc eod eoe eog eoh eok eoo g-d gaa gab gac gad gae gag gah gak gao gba gbc gbd gbe gbg gbh gbk gbo gca gcb gcc gcd gce gcg gch gck gco gda gdb gdc gdd gde gdh gdk gdo ge- gea geb gec ged gee geg geh gek geo gga ggb ggc ggd ggg ggh ggo gha ghb ghc ghd ghe ghg ghh gho gka gkb gkd gkh gko goa gob goc god goe gog goh gok goo haa hab hac had hae hag hah hak hao hba hbb hbc hbd hbe hbg hbh hbk hbo hca hcb hcc hcd hce hcg hch hck hco hda hdb hdc hdd hde hdg hdh hdk hdo he- hea heb hec hed hee heg heh hek heo hga hgb hgc hge hgg hgh hgk hgo hha hhb hhc hhd hhe hhg hhh hhk hho hka hkb hkd hkg hkh hkk hko hoa hob hoc hod hoe hog hoh hok hoo ka- kaa kab kac kad kae kag kah kak kao kba kbb kbc kbd kbe kbh kbk kbo kca kcb kcc kcd kce kcg kch kck kda kdb kdc kde kdg kdh kdk kdo ke- kea keb kec ked kee keg keh kek keo kga kgb kgc kgd kgh kgo kha khe khh khk kho kkb kkc kke kkh kkk koa kob koc kod koe kog koh kok koo oaa oab oac oad oae oag oah oak oao ob- oba obb obc obd obe obg obh obk obo oc- oca ocb occ ocd ocg och ock oco oda odb odc odd ode odg odh odo oea oeb oec oed oee oeg oeh oeo oga ogc ogd oge ogg ogh ogo oha ohc ohd ohe ohg ohh oho oka okb okc okd oke okg okk oko oo- ooa oob ooc ood oog ooh ook ooo