-ic a-a a-b a-c a-i a-t aaa aab aac aai aar aat aau ab- aba abb abc abi abr abt abu ac- aca acb acc aci acr act acu ai- aia aib aic aii air ait aiu ar- ara arb arc ari arr art aru at- ata atb atc ati atr att atu au- aua aub auc aui aur aut b-u baa bab bac bai bar bat bau bba bbb bbc bbi bbr bbt bbu bca bcb bcc bci bcr bct bcu bi- bia bib bic bii bir bit biu bra brb bri brr brt bru bta btb btc bti btr btt btu bua bub buc bui bur but buu c-- caa cab cac cai car cat cau cba cbb cbc cbi cbr cbt cbu cca ccb ccc cci ccr cct ccu ci- cia cib cic cii cir cit ciu cra crb crc cri crr crt cru cta ctb ctc cti ctr ctt ctu cua cub cuc cui cur cut cuu ia- iaa iab iac iai iar iat iau iba ibb ibc ibi ibr ibt ibu ica icb icc ici icr ict icu iia iib iic iii iir iit iiu ir- ira irb irc iri irr irt iru ita itb itc iti itt itu iu- iua iub iuc iui iur iut ra- raa rab rac rai rar rat rau rba rbb rbc rbi rbr rbt rbu rca rcb rcc rci rcr rct rcu ria rib ric rii rir rit rra rrb rrc rri rrr rrt rru rta rtb rtc rti rtr rtt rtu rua rub ruc rui rur rut ruu taa tab tac tai tar tat tau tba tbb tbc tbi tbr tbt tbu tca tcb tcc tci tcr tct tcu tia tib tic tii tir tit tiu tra trb trc tri trr trt tru tta ttb ttc tti ttr ttt ttu tua tub tuc tui tur tut tuu ua- uaa uab uac uai uar uat uau uba ubb ubc ubi ubr ubt ubu uca ucb ucc uci ucr uct ucu uia uib uic uii uir uit uiu ur- ura urb urc uri urr urt uru uta utb utc uti utr utt utu uua uuc uur uut uuu