a-a a-b a-c a-t aaa aab aac aag aar aat aau ab- aba abb abc abg abr abt abu ac- aca acb acc acg acr act acu ag- aga agb agc agg agr agt agu ar- ara arb arc arg arr art aru at- ata atb atc atg atr att atu au- aua aub auc aug aur aut b-u baa bab bac bag bar bat bau bba bbb bbc bbg bbr bbt bbu bca bcb bcc bcg bcr bct bcu bga bgb bgc bgg bgr bgt bgu bra brb brg brr brt bru bta btb btc btg btr btt btu bua bub buc bug bur but buu c-- caa cab cac cag car cat cau cba cbb cbc cbg cbr cbt cbu cca ccb ccc ccg ccr cct ccu cga cgb cgc cgg cgr cgt cgu cra crb crc crg crr crt cru cta ctb ctc ctg ctr ctt ctu cua cub cuc cug cur cut cuu gaa gab gac gag gar gat gau gba gbc gbg gbr gbt gbu gca gcb gcc gcg gcr gct gcu gga ggb ggc ggg ggr ggt ggu gra grb grc grg grr grt gru gta gtb gtc gtg gtr gtt gtu gu- gua gub guc gug gur gut guu ra- raa rab rac rag rar rat rau rba rbb rbc rbg rbr rbt rbu rca rcb rcc rcg rcr rct rcu rga rgb rgc rgg rgr rgt rra rrb rrc rrg rrr rrt rru rta rtb rtc rtg rtr rtt rtu rua rub ruc rug rur rut ruu taa tab tac tag tar tat tau tba tbb tbc tbg tbr tbt tbu tca tcb tcc tcg tcr tct tcu tga tgb tgc tgg tgr tgt tgu tra trb trc trg trr trt tru tta ttb ttc ttg ttr ttt ttu tua tub tuc tug tur tut tuu ua- uaa uab uac uag uar uat uau uba ubb ubc ubg ubr ubt ubu uca ucb ucc ucg ucr uct ucu uga ugb ugc ugg ugr ugt ugu ur- ura urb urc urg urr urt uru uta utb utc utr utt utu uua uuc uug uur uut uuu