-ic a-a a-b a-c a-i a-t aaa aab aac aai aak aar aat aau ab- aba abb abc abi abk abr abt abu ac- aca acb acc aci ack acr act acu ai- aia aib aic aii aik air ait aiu aka akb akc aki akk akr aku ar- ara arb arc ari ark arr art aru at- ata atb atc ati atr att atu au- aua aub auc aui auk aur aut b-u baa bab bac bai bak bar bat bau bba bbb bbc bbi bbk bbr bbt bbu bca bcb bcc bci bck bcr bct bcu bi- bia bib bic bii bik bir bit biu bka bkb bkc bkk bkr bkt bra brb bri brk brr brt bru bta btb btc bti btk btr btt btu bua bub buc bui buk bur but buu c-- caa cab cac cai cak car cat cau cba cbb cbc cbi cbk cbr cbt cbu cca ccb ccc cci cck ccr cct ccu ci- cia cib cic cii cik cir cit ciu cka ckb ckc cki ckt cra crb crc cri crk crr crt cru cta ctb ctc cti ctk ctr ctt ctu cua cub cuc cui cuk cur cut cuu ia- iaa iab iac iai iar iat iau iba ibb ibc ibi ibk ibr ibt ibu ica icb icc ici ick icr ict icu iia iib iic iii iir iit iiu ika ikb ikc iki ikk ikr ikt iku ir- ira irb irc iri irk irr irt iru ita itb itc iti itk itt itu iu- iua iub iuc iui iur iut k-t ka- kaa kab kac kai kak kar kat kau kba kbb kbc kbi kbk kbr kbu kca kcb kcc kci kck kcr kct kcu kia kib kic kii kik kir kit kiu kkb kkc kki kkk kkr kkt kku kra krc kri krk krr krt kru kta ktb ktc ktk ktr ktt ktu kub kuc kui kuk kur kut kuu ra- raa rab rac rai rak rar rat rau rba rbb rbc rbi rbk rbr rbt rbu rca rcb rcc rci rcr rct rcu ria rib ric rii rik rir rit rkb rkc rkk rkt rku rra rrb rrc rri rrk rrr rrt rru rta rtb rtc rti rtk rtr rtt rtu rua rub ruc rui ruk rur rut ruu taa tab tac tai tak tar tat tau tba tbb tbc tbi tbk tbr tbt tbu tca tcb tcc tci tck tcr tct tcu tia tib tic tii tik tir tit tiu tka tkb tkc tkk tkr tkt tra trb trc tri trk trr trt tru tta ttb ttc tti ttk ttr ttt ttu tua tub tuc tui tuk tur tut tuu ua- uaa uab uac uai uak uar uat uau uba ubb ubc ubi ubk ubr ubt ubu uca ucb ucc uci uck ucr uct ucu uia uib uic uii uir uit uiu uka ukb ukc uki ukk ukr uku ur- ura urb urc uri urk urr urt uru uta utb utc uti utk utr utt utu uua uuc uur uut uuu