-ic b-u bbb bbc bbi bbk bbr bbt bbu bcb bcc bci bck bcr bct bcu bi- bib bic bii bik bir bit biu bkb bkc bkk bkr bkt brb bri brk brr brt bru btb btc bti btk btr btt btu bub buc bui buk bur but buu c-- cbb cbc cbi cbk cbr cbt cbu ccb ccc cci cck ccr cct ccu ci- cib cic cii cik cir cit ciu ckb ckc cki ckt crb crc cri crk crr crt cru ctb ctc cti ctk ctr ctt ctu cub cuc cui cuk cur cut cuu ibb ibc ibi ibk ibr ibt ibu icb icc ici ick icr ict icu iib iic iii iir iit iiu ikb ikc iki ikk ikr ikt iku ir- irb irc iri irk irr irt iru itb itc iti itk itt itu iu- iub iuc iui iur iut k-t kbb kbc kbi kbk kbr kbu kcb kcc kci kck kcr kct kcu kib kic kii kik kir kit kiu kkb kkc kki kkk kkr kkt kku krc kri krk krr krt kru ktb ktc ktk ktr ktt ktu kub kuc kui kuk kur kut kuu rbb rbc rbi rbk rbr rbt rbu rcb rcc rci rcr rct rcu rib ric rii rik rir rit rkb rkc rkk rkt rku rrb rrc rri rrk rrr rrt rru rtb rtc rti rtk rtr rtt rtu rub ruc rui ruk rur rut ruu tbb tbc tbi tbk tbr tbt tbu tcb tcc tci tck tcr tct tcu tib tic tii tik tir tit tiu tkb tkc tkk tkr tkt trb trc tri trk trr trt tru ttb ttc tti ttk ttr ttt ttu tub tuc tui tuk tur tut tuu ubb ubc ubi ubk ubr ubt ubu ucb ucc uci uck ucr uct ucu uib uic uii uir uit uiu ukb ukc uki ukk ukr uku ur- urb urc uri urk urr urt uru utb utc uti utk utr utt utu uuc uur uut uuu