-th a-a a-b a-c a-t aaa aab aac aah aak aan aao aat ab- aba abb abc abh abk abn abo abt ac- aca acb acc ach ack acn aco act aha ahb ahc ahh ahk ahn aho aht aka akb akc akh akk akn ako an- ana anb anc anh ank ann ano ant aoa aob aoc aoh aok aon aoo aot at- ata atb atc ath atn ato att baa bab bac bah bak ban bao bat bba bbb bbc bbh bbk bbn bbo bbt bca bcb bcc bch bck bcn bco bct bha bhb bhc bhh bhk bho bht bka bkb bkc bkk bkn bko bkt bna bnb bnc bnk bnn bno bnt boa bob boc boh bok bon boo bot bta btb btc bth btk btn bto btt c-- caa cab cac cah cak can cao cat cba cbb cbc cbh cbk cbn cbo cbt cca ccb ccc cch cck ccn cco cct ch- cha chb chc chh chk chn cho cht cka ckb ckc ckh cko ckt cn- cna cnb cnc cnh cnn cno cnt co- coa cob coc coh cok con coo cot cta ctb ctc cth ctk ctn cto ctt haa hab hac hah hak han hao hat hba hbb hbc hbh hbk hbn hbo hbt hca hcb hcc hch hck hcn hco hct hha hhb hhc hhh hhk hhn hho hht hka hkb hkh hkk hkn hko hkt hna hnb hnc hnh hnk hnn hno hnt hoa hob hoc hoh hok hon hoo hot hta htb htc hth htk htn hto htt k-t ka- kaa kab kac kah kak kan kao kat kba kbb kbc kbh kbk kbn kbo kca kcb kcc kch kck kcn kct kha khh khk khn kho kkb kkc kkh kkk kkn kkt kn- kna knc knk knn kno knt koa kob koc koh kok kon koo kot kta ktb ktc kth ktk ktn kto ktt naa nab nac nah nak nan nao nat nba nbb nbc nbk nbn nbo nbt nca ncb ncc nch nck ncn nco nct nha nhb nhc nhh nhk nhn nht nka nkc nkk nkn nko nkt nna nnb nnc nnh nnk nnn nno nnt no- noa nob noc noh nok non noo not nta ntb ntc nth ntk ntn nto ntt oaa oab oac oah oak oan oao oat ob- oba obb obc obh obk obn obo obt oc- oca ocb occ och ock ocn oco oct oha ohc ohh ohn oho oht oka okb okc okk oko on- ona onb onc onh onk onn ono ont oo- ooa oob ooc ooh ook oon ooo oot ot- ota otb otc oth otk otn oto ott taa tab tac tah tak tan tao tat tba tbb tbc tbh tbk tbn tbo tbt tca tcb tcc tch tck tcn tco tct th- tha thb thc thh thk thn tho tht tka tkb tkc tkk tko tkt tna tnb tnc tnh tnk tnn tno tnt to- toa tob toc toh tok ton too tot tta ttb ttc tth ttk ttn tto ttt