a-a a-b a-c a-t aaa aab aac aak aao aat aav ab- aba abb abc abk abo abt abv ac- aca acb acc ack aco act acv aka akb akc akk ako akv aoa aob aoc aok aoo aot aov at- ata atb atc ato att atv av- ava avb avc avk avo avt baa bab bac bak bao bat bav bba bbb bbc bbk bbo bbt bca bcb bcc bck bco bct bcv bka bkb bkc bkk bko bkt bkv boa bob boc bok boo bot bov bta btb btc btk bto btt btv bva bvb bvc bvk bvo bvt bvv c-- caa cab cac cak cao cat cav cba cbb cbc cbk cbo cbt cbv cca ccb ccc cck cco cct ccv cka ckb ckc cko ckt co- coa cob coc cok coo cot cov cta ctb ctc ctk cto ctt ctv cva cvb cvc cvk cvo cvt cvv k-t ka- kaa kab kac kak kao kat kav kba kbb kbc kbk kbo kca kcb kcc kck kct kkb kkc kkk kkt kkv koa kob koc kok koo kot kta ktb ktc ktk kto ktt ktv kva kvb kvk kvo kvv oaa oab oac oak oao oat oav ob- oba obb obc obk obo obt obv oc- oca ocb occ ock oco oct ocv oka okb okc okk oko oo- ooa oob ooc ook ooo oot oov ot- ota otb otc otk oto ott otv ov- ova ovb ovc ovo ovv taa tab tac tak tao tat tav tba tbb tbc tbk tbo tbt tbv tca tcb tcc tck tco tct tcv tka tkb tkc tkk tko tkt to- toa tob toc tok too tot tov tta ttb ttc ttk tto ttt ttv tva tvb tvc tvk tvo tvt v-a vaa vab vac vak vao vat vav vba vbc vbk vbo vbv vca vcc vco vct vka vkb vkt voa vob voc vok voo vot vov vta vtb vtc vtk vto vtt vtv vva vvb vvc vvo vvt vvv