-ic b-u bbb bbc bbi bbk bbn bbr bbs bbu bcb bcc bci bck bcn bcr bcs bcu bi- bib bic bii bik bin bir bis biu bkb bkc bkk bkn bkr bks bnb bnc bni bnk bnn bnr bns bnu brb bri brk brn brr brs bru bsb bsc bsi bsk bsn bsr bss bsu bub buc bui buk bun bur bus buu c-- cbb cbc cbi cbk cbn cbr cbs cbu ccb ccc cci cck ccn ccr ccs ccu ci- cib cic cii cik cin cir cis ciu ckb ckc cki cks cn- cnb cnc cni cnn cnr cns cnu crb crc cri crk crn crr crs cru csb csc csi csk csn csr css csu cub cuc cui cuk cun cur cus cuu ibb ibc ibi ibk ibn ibr ibs ibu icb icc ici ick icn icr ics icu iib iic iii iin iir iis iiu ikb ikc iki ikk ikr iks iku in- inb inc ini ink inn inr ins inu ir- irb irc iri irk irn irr irs iru is- isb isc isi isk isn isr iss isu iu- iub iuc iui iur ius kbb kbc kbi kbk kbn kbr kbs kbu kcb kcc kci kck kcn kcr kcs kcu kib kic kii kik kin kir kis kiu kkb kkc kki kkk kkn kkr kks kku kn- knc kni knk knn knr knu krc kri krk krn krr krs kru ksb ksc ksi ksk ksn ksr kss ksu kub kuc kui kuk kun kur kus kuu n-i nbb nbc nbi nbk nbn nbr nbs nbu ncb ncc nci nck ncn ncr ncs ncu nib nic nii nik nin nir nis niu nkc nki nkk nkn nkr nks nku nnb nnc nni nnk nnn nns nnu nrb nrc nri nrk nrn nrr nrs nru nsb nsc nsi nsk nsn nsr nss nsu nub nuc nui nuk nun nur nus nuu rbb rbc rbi rbk rbn rbr rbs rbu rcb rcc rci rcn rcr rcs rcu rib ric rii rik rin rir ris rkb rkc rkk rks rku rnb rnc rni rnn rnr rns rnu rrb rrc rri rrk rrn rrr rrs rru rsb rsc rsi rsk rsn rsr rss rsu rub ruc rui ruk run rur rus ruu sbb sbc sbi sbk sbn sbr sbs sbu scb scc sci sck scn scr scs scu sib sic sii sik sin sir sis siu sk- skb skc ski skk skr sks sku snb snc sni snk snn snr sns snu sr- srb src sri srk srn srr srs ss- ssb ssc ssi ssk ssn ssr sss ssu sub suc sui suk sun sur sus suu ubb ubc ubi ubk ubn ubr ubs ubu ucb ucc uci uck ucn ucr ucs ucu uib uic uii uin uir uis uiu ukb ukc uki ukk ukn ukr uku un- unb unc uni unk unn unr uns unu ur- urb urc uri urk urn urr urs uru usb usc usi usk usn usr uss usu uuc uun uur uus uuu