a-a a-b a-c a-t aaa aab aac aak aao aat aau ab- aba abb abc abk abo abt abu ac- aca acb acc ack aco act acu aka akb akc akk ako aku aoa aob aoc aok aoo aot aou at- ata atb atc ato att atu au- aua aub auc auk auo aut b-u baa bab bac bak bao bat bau bba bbb bbc bbk bbo bbt bbu bca bcb bcc bck bco bct bcu bka bkb bkc bkk bko bkt boa bob boc bok boo bot bou bta btb btc btk bto btt btu bua bub buc buk buo but buu c-- caa cab cac cak cao cat cau cba cbb cbc cbk cbo cbt cbu cca ccb ccc cck cco cct ccu cka ckb ckc cko ckt co- coa cob coc cok coo cot cou cta ctb ctc ctk cto ctt ctu cua cub cuc cuk cuo cut cuu k-t ka- kaa kab kac kak kao kat kau kba kbb kbc kbk kbo kbu kca kcb kcc kck kct kcu kkb kkc kkk kkt kku koa kob koc kok koo kot kou kta ktb ktc ktk kto ktt ktu kub kuc kuk kut kuu oaa oab oac oak oao oat oau ob- oba obb obc obk obo obt obu oc- oca ocb occ ock oco oct ocu oka okb okc okk oko oku oo- ooa oob ooc ook ooo oot ot- ota otb otc otk oto ott otu ou- oua ouc ouk ouo out taa tab tac tak tao tat tau tba tbb tbc tbk tbo tbt tbu tca tcb tcc tck tco tct tcu tka tkb tkc tkk tko tkt to- toa tob toc tok too tot tou tta ttb ttc ttk tto ttt ttu tua tub tuc tuk tuo tut tuu ua- uaa uab uac uak uao uat uau uba ubb ubc ubk ubo ubt ubu uca ucb ucc uck uco uct ucu uka ukb ukc ukk uku uoa uob uoc uok uoo uot uta utb utc utk uto utt utu uua uuc uut uuu