a-a a-b a-c aaa aab aac aad aae aag aah aak ab- aba abb abc abd abe abg abh abk ac- aca acb acc acd ace acg ach ack ad- ada adb adc add ade adg adh adk aea aeb aec aed aee aeg aeh aek ag- aga agb agc agd age agg agh agk aha ahb ahc ahd ahe ahg ahh ahk aka akb akc akd ake akg akh akk baa bab bac bad bae bag bah bak bba bbb bbc bbd bbe bbg bbh bbk bca bcb bcc bcd bce bcg bch bck bda bdb bdc bdd bde bdg bdh bdk be- bea beb bec bed bee beg beh bek bga bgb bgc bgd bge bgg bgh bgk bha bhb bhc bhd bhe bhg bhh bhk bka bkb bkc bke bkg bkk c-- caa cab cac cad cae cag cah cak cba cbb cbc cbd cbe cbg cbh cbk cca ccb ccc ccd cce ccg cch cck cda cdb cdc cdd cde cdg cdh cdk ce- cea ceb cec ced cee ceg ceh cek cga cgb cgc cgd cge cgg cgh ch- cha chb chc chd che chg chh chk cka ckb ckc ckd ckh daa dab dac dad dae dag dah dak dba dbb dbc dbd dbe dbg dbh dbk dca dcb dcc dcd dce dcg dck dda ddb ddc ddd dde ddg ddh ddk de- dea deb dec ded dee deg deh dek dga dgc dgd dge dgg dgh dgk dh- dha dhb dhc dhd dhe dhh dhk dka dkb dkc dke dkg dkk eaa eab eac ead eae eag eah eak eba ebb ebc ebd ebe ebg ebh ebk ec- eca ecb ecc ecd ece ecg ech eck ed- eda edb edc edd ede edg edh edk eea eeb eec eed eee eeg eek ega egb egc egd ege egg egh eha ehb ehc ehd ehe ehg ehh eka ekb ekc ekd eke ekg ekh g-d gaa gab gac gad gae gag gah gak gba gbc gbd gbe gbg gbh gbk gca gcb gcc gcd gce gcg gch gck gda gdb gdc gdd gde gdh gdk ge- gea geb gec ged gee geg geh gek gga ggb ggc ggd ggg ggh gha ghb ghc ghd ghe ghg ghh gka gkb gkd gkh haa hab hac had hae hag hah hak hba hbb hbc hbd hbe hbg hbh hbk hca hcb hcc hcd hce hcg hch hck hda hdb hdc hdd hde hdg hdh hdk he- hea heb hec hed hee heg heh hek hga hgb hgc hge hgg hgh hgk hha hhb hhc hhd hhe hhg hhh hhk hka hkb hkd hkg hkh hkk ka- kaa kab kac kad kae kag kah kak kba kbb kbc kbd kbe kbh kbk kca kcb kcc kcd kce kcg kch kck kda kdb kdc kde kdg kdh kdk ke- kea keb kec ked kee keg keh kek kga kgb kgc kgd kgh kha khe khh khk kkb kkc kke kkh kkk