-er a-a a-b a-t a-z aaa aab aae aag aar aat aau aaz ab- aba abb abe abg abr abt abu abz aea aeb aee aeg aer aet aeu aez ag- aga agb age agg agr agt agu agz ar- ara arb are arg arr art aru arz at- ata atb ate atg atr att atu atz au- aua aub aue aug aur aut auz az- aza azb aze azg azt azu azz b-u baa bab bae bag bar bat bau baz bba bbb bbe bbg bbr bbt bbu be- bea beb bee beg ber bet beu bez bga bgb bge bgg bgr bgt bgu bgz bra brb bre brg brr brt bru brz bta btb bte btg btr btt btu btz bua bub bue bug bur but buu buz bza bze bzr bzu bzz eaa eab eae eag ear eat eau eaz eba ebb ebe ebg ebr ebt ebu eea eeb eee eeg eer eet ega egb ege egg egr egt egu era erb ere erg err ert eru erz eta etb ete etg etr ett etu etz eu- eua eub eue eug eur eut eze ezr ezz gaa gab gae gag gar gat gau gaz gba gbe gbg gbr gbt gbu gbz ge- gea geb gee geg ger get geu gez gga ggb ggg ggr ggt ggu ggz gra grb gre grg grr grt gru gta gtb gte gtg gtr gtt gtu gu- gua gub gue gug gur gut guu guz gza gzr gzu ra- raa rab rae rag rar rat rau raz rba rbb rbe rbg rbr rbt rbu re- rea reb ree reg rer ret reu rez rga rgb rge rgg rgr rgt rra rrb rrg rrr rrt rru rta rtb rte rtg rtr rtt rtu rtz rua rub rue rug rur rut ruu ruz rza rzb rze taa tab tae tag tar tat tau taz tba tbb tbe tbg tbr tbt tbu tbz te- tea teb tee teg ter tet teu tez tga tgb tge tgg tgr tgt tgu tgz tra trb tre trg trr trt tru trz tta ttb tte ttg ttr ttt ttu tua tub tue tug tur tut tuu tuz tza tze tzu ua- uaa uab uae uag uar uat uau uaz uba ubb ube ubg ubr ubt ubu uea ueb uee ueg uer uet uga ugb uge ugg ugr ugt ugu ur- ura urb ure urg urr urt uru urz uta utb ute utr utt utu utz uua uue uug uur uut uuu uza uzb uzu z-g zaa zab zag zar zat zaz zbb zbr zbt zea zeb zee zer zet zez zgb zgg zta zte ztr zub zug zur zut zuz zzr zzt zzz