-ic b-u bbb bbc bbi bbk bbr bbs bbu bcb bcc bci bck bcr bcs bcu bi- bib bic bii bik bir bis biu bkb bkc bkk bkr bks brb bri brk brr brs bru bsb bsc bsi bsk bsr bss bsu bub buc bui buk bur bus buu c-- cbb cbc cbi cbk cbr cbs cbu ccb ccc cci cck ccr ccs ccu ci- cib cic cii cik cir cis ciu ckb ckc cki cks crb crc cri crk crr crs cru csb csc csi csk csr css csu cub cuc cui cuk cur cus cuu ibb ibc ibi ibk ibr ibs ibu icb icc ici ick icr ics icu iib iic iii iir iis iiu ikb ikc iki ikk ikr iks iku ir- irb irc iri irk irr irs iru is- isb isc isi isk isr iss isu iu- iub iuc iui iur ius kbb kbc kbi kbk kbr kbs kbu kcb kcc kci kck kcr kcs kcu kib kic kii kik kir kis kiu kkb kkc kki kkk kkr kks kku krc kri krk krr krs kru ksb ksc ksi ksk ksr kss ksu kub kuc kui kuk kur kus kuu rbb rbc rbi rbk rbr rbs rbu rcb rcc rci rcr rcs rcu rib ric rii rik rir ris rkb rkc rkk rks rku rrb rrc rri rrk rrr rrs rru rsb rsc rsi rsk rsr rss rsu rub ruc rui ruk rur rus ruu sbb sbc sbi sbk sbr sbs sbu scb scc sci sck scr scs scu sib sic sii sik sir sis siu sk- skb skc ski skk skr sks sku sr- srb src sri srk srr srs ss- ssb ssc ssi ssk ssr sss ssu sub suc sui suk sur sus suu ubb ubc ubi ubk ubr ubs ubu ucb ucc uci uck ucr ucs ucu uib uic uii uir uis uiu ukb ukc uki ukk ukr uku ur- urb urc uri urk urr urs uru usb usc usi usk usr uss usu uuc uur uus uuu