-er -ic a-a a-b a-c a-i a-t aaa aab aac aae aag aai aar aat aau ab- aba abb abc abe abg abi abr abt abu ac- aca acb acc ace acg aci acr act acu aea aeb aec aee aeg aei aer aet aeu ag- aga agb agc age agg agi agr agt agu ai- aia aib aic aie aig aii air ait aiu ar- ara arb arc are arg ari arr art aru at- ata atb atc ate atg ati atr att atu au- aua aub auc aue aug aui aur aut b-u baa bab bac bae bag bai bar bat bau bba bbb bbc bbe bbg bbi bbr bbt bbu bca bcb bcc bce bcg bci bcr bct bcu be- bea beb bec bee beg bei ber bet beu bga bgb bgc bge bgg bgi bgr bgt bgu bi- bia bib bic bie big bii bir bit biu bra brb bre brg bri brr brt bru bta btb btc bte btg bti btr btt btu bua bub buc bue bug bui bur but buu c-- caa cab cac cae cag cai car cat cau cba cbb cbc cbe cbg cbi cbr cbt cbu cca ccb ccc cce ccg cci ccr cct ccu ce- cea ceb cec cee ceg cei cer cet ceu cga cgb cgc cge cgg cgi cgr cgt cgu ci- cia cib cic cie cig cii cir cit ciu cra crb crc cre crg cri crr crt cru cta ctb ctc cte ctg cti ctr ctt ctu cua cub cuc cue cug cui cur cut cuu eaa eab eac eae eag eai ear eat eau eba ebb ebc ebe ebg ebi ebr ebt ebu ec- eca ecb ecc ece ecg eci ecr ect ecu eea eeb eec eee eeg eer eet ega egb egc ege egg egi egr egt egu eia eib eic eie eig eii eir eit eiu era erb erc ere erg eri err ert eru eta etb etc ete etg eti etr ett etu eu- eua eub euc eue eug eui eur eut gaa gab gac gae gag gai gar gat gau gba gbc gbe gbg gbi gbr gbt gbu gca gcb gcc gce gcg gci gcr gct gcu ge- gea geb gec gee geg gei ger get geu gga ggb ggc ggg ggi ggr ggt ggu gia gib gic gie gig gii gir git giu gra grb grc gre grg gri grr grt gru gta gtb gtc gte gtg gti gtr gtt gtu gu- gua gub guc gue gug gui gur gut guu ia- iaa iab iac iae iag iai iar iat iau iba ibb ibc ibe ibg ibi ibr ibt ibu ica icb icc ice icg ici icr ict icu ie- iea iec iee ieg iei ier iet iga igb igc ige igg igi igr igt igu iia iib iic iie iii iir iit iiu ir- ira irb irc ire irg iri irr irt iru ita itb itc ite itg iti itt itu iu- iua iub iuc iue iug iui iur iut ra- raa rab rac rae rag rai rar rat rau rba rbb rbc rbe rbg rbi rbr rbt rbu rca rcb rcc rce rcg rci rcr rct rcu re- rea reb rec ree reg rei rer ret reu rga rgb rgc rge rgg rgi rgr rgt ria rib ric rie rig rii rir rit rra rrb rrc rrg rri rrr rrt rru rta rtb rtc rte rtg rti rtr rtt rtu rua rub ruc rue rug rui rur rut ruu taa tab tac tae tag tai tar tat tau tba tbb tbc tbe tbg tbi tbr tbt tbu tca tcb tcc tce tcg tci tcr tct tcu te- tea teb tec tee teg tei ter tet teu tga tgb tgc tge tgg tgi tgr tgt tgu tia tib tic tie tig tii tir tit tiu tra trb trc tre trg tri trr trt tru tta ttb ttc tte ttg tti ttr ttt ttu tua tub tuc tue tug tui tur tut tuu ua- uaa uab uac uae uag uai uar uat uau uba ubb ubc ube ubg ubi ubr ubt ubu uca ucb ucc uce ucg uci ucr uct ucu uea ueb uec uee ueg uei uer uet uga ugb ugc uge ugg ugi ugr ugt ugu uia uib uic uie uig uii uir uit uiu ur- ura urb urc ure urg uri urr urt uru uta utb utc ute uti utr utt utu uua uuc uue uug uur uut uuu