a-a a-b a-c aaa aab aac aae aag aak aau ab- aba abb abc abe abg abk abu ac- aca acb acc ace acg ack acu aea aeb aec aee aeg aek aeu ag- aga agb agc age agg agk agu aka akb akc ake akg akk aku au- aua aub auc aue aug auk b-u baa bab bac bae bag bak bau bba bbb bbc bbe bbg bbk bbu bca bcb bcc bce bcg bck bcu be- bea beb bec bee beg bek beu bga bgb bgc bge bgg bgk bgu bka bkb bkc bke bkg bkk bua bub buc bue bug buk buu c-- caa cab cac cae cag cak cau cba cbb cbc cbe cbg cbk cbu cca ccb ccc cce ccg cck ccu ce- cea ceb cec cee ceg cek ceu cga cgb cgc cge cgg cgu cka ckb ckc cua cub cuc cue cug cuk cuu eaa eab eac eae eag eak eau eba ebb ebc ebe ebg ebk ebu ec- eca ecb ecc ece ecg eck ecu eea eeb eec eee eeg eek ega egb egc ege egg egu eka ekb ekc eke ekg eku eu- eua eub euc eue eug gaa gab gac gae gag gak gau gba gbc gbe gbg gbk gbu gca gcb gcc gce gcg gck gcu ge- gea geb gec gee geg gek geu gga ggb ggc ggg ggu gka gkb gu- gua gub guc gue gug guk guu ka- kaa kab kac kae kag kak kau kba kbb kbc kbe kbk kbu kca kcb kcc kce kcg kck kcu ke- kea keb kec kee keg kek kga kgb kgc kgu kkb kkc kke kkk kku kub kuc kue kug kuk kuu ua- uaa uab uac uae uag uak uau uba ubb ubc ube ubg ubk ubu uca ucb ucc uce ucg uck ucu uea ueb uec uee ueg uga ugb ugc uge ugg ugk ugu uka ukb ukc uke ukk uku uua uuc uue uug uuu