-th a-a a-b a-c a-t aaa aab aac aae aah aak aao aat ab- aba abb abc abe abh abk abo abt ac- aca acb acc ace ach ack aco act aea aeb aec aee aeh aek aeo aet aha ahb ahc ahe ahh ahk aho aht aka akb akc ake akh akk ako aoa aob aoc aoe aoh aok aoo aot at- ata atb atc ate ath ato att baa bab bac bae bah bak bao bat bba bbb bbc bbe bbh bbk bbo bbt bca bcb bcc bce bch bck bco bct be- bea beb bec bee beh bek beo bet bha bhb bhc bhe bhh bhk bho bht bka bkb bkc bke bkk bko bkt boa bob boc boe boh bok boo bot bta btb btc bte bth btk bto btt c-- caa cab cac cae cah cak cao cat cba cbb cbc cbe cbh cbk cbo cbt cca ccb ccc cce cch cck cco cct ce- cea ceb cec cee ceh cek ceo cet ch- cha chb chc che chh chk cho cht cka ckb ckc ckh cko ckt co- coa cob coc coe coh cok coo cot cta ctb ctc cte cth ctk cto ctt eaa eab eac eae eah eak eao eat eba ebb ebc ebe ebh ebk ebo ebt ec- eca ecb ecc ece ech eck eco ect eea eeb eec eee eek eeo eet eha ehb ehc ehe ehh eho eht eka ekb ekc eke ekh eko ekt eo- eoa eob eoc eoe eoh eok eoo eot eta etb etc ete eth etk eto ett haa hab hac hae hah hak hao hat hba hbb hbc hbe hbh hbk hbo hbt hca hcb hcc hce hch hck hco hct he- hea heb hec hee heh hek heo het hha hhb hhc hhe hhh hhk hho hht hka hkb hkh hkk hko hkt hoa hob hoc hoe hoh hok hoo hot hta htb htc hte hth htk hto htt k-t ka- kaa kab kac kae kah kak kao kat kba kbb kbc kbe kbh kbk kbo kca kcb kcc kce kch kck kct ke- kea keb kec kee keh kek keo ket kha khe khh khk kho kkb kkc kke kkh kkk kkt koa kob koc koe koh kok koo kot kta ktb ktc kte kth ktk kto ktt oaa oab oac oae oah oak oao oat ob- oba obb obc obe obh obk obo obt oc- oca ocb occ och ock oco oct oea oeb oec oee oeh oeo oet oha ohc ohe ohh oho oht oka okb okc oke okk oko oo- ooa oob ooc ooh ook ooo oot ot- ota otb otc ote oth otk oto ott taa tab tac tae tah tak tao tat tba tbb tbc tbe tbh tbk tbo tbt tca tcb tcc tce tch tck tco tct te- tea teb tec tee teh tek teo tet th- tha thb thc the thh thk tho tht tka tkb tkc tke tkk tko tkt to- toa tob toc toe toh tok too tot tta ttb ttc tte tth ttk tto ttt