-ic b-u bbb bbc bbi bbk bbr bbu bcb bcc bci bck bcr bcu bi- bib bic bii bik bir biu bkb bkc bkk bkr brb bri brk brr bru bub buc bui buk bur buu c-- cbb cbc cbi cbk cbr cbu ccb ccc cci cck ccr ccu ci- cib cic cii cik cir ciu ckb ckc cki crb crc cri crk crr cru cub cuc cui cuk cur cuu ibb ibc ibi ibk ibr ibu icb icc ici ick icr icu iib iic iii iir iiu ikb ikc iki ikk ikr iku ir- irb irc iri irk irr iru iu- iub iuc iui iur kbb kbc kbi kbk kbr kbu kcb kcc kci kck kcr kcu kib kic kii kik kir kiu kkb kkc kki kkk kkr kku krc kri krk krr kru kub kuc kui kuk kur kuu rbb rbc rbi rbk rbr rbu rcb rcc rci rcr rcu rib ric rii rik rir rkb rkc rkk rku rrb rrc rri rrk rrr rru rub ruc rui ruk rur ruu ubb ubc ubi ubk ubr ubu ucb ucc uci uck ucr ucu uib uic uii uir uiu ukb ukc uki ukk ukr uku ur- urb urc uri urk urr uru uuc uur uuu