-ic bbb bbc bbi bbk bbn bbr bbs bcb bcc bci bck bcn bcr bcs bi- bib bic bii bik bin bir bis bkb bkc bkk bkn bkr bks bnb bnc bni bnk bnn bnr bns brb bri brk brn brr brs bsb bsc bsi bsk bsn bsr bss c-- cbb cbc cbi cbk cbn cbr cbs ccb ccc cci cck ccn ccr ccs ci- cib cic cii cik cin cir cis ckb ckc cki cks cn- cnb cnc cni cnn cnr cns crb crc cri crk crn crr crs csb csc csi csk csn csr css ibb ibc ibi ibk ibn ibr ibs icb icc ici ick icn icr ics iib iic iii iin iir iis ikb ikc iki ikk ikr iks in- inb inc ini ink inn inr ins ir- irb irc iri irk irn irr irs is- isb isc isi isk isn isr iss kbb kbc kbi kbk kbn kbr kbs kcb kcc kci kck kcn kcr kcs kib kic kii kik kin kir kis kkb kkc kki kkk kkn kkr kks kn- knc kni knk knn knr krc kri krk krn krr krs ksb ksc ksi ksk ksn ksr kss n-i nbb nbc nbi nbk nbn nbr nbs ncb ncc nci nck ncn ncr ncs nib nic nii nik nin nir nis nkc nki nkk nkn nkr nks nnb nnc nni nnk nnn nns nrb nrc nri nrk nrn nrr nrs nsb nsc nsi nsk nsn nsr nss rbb rbc rbi rbk rbn rbr rbs rcb rcc rci rcn rcr rcs rib ric rii rik rin rir ris rkb rkc rkk rks rnb rnc rni rnn rnr rns rrb rrc rri rrk rrn rrr rrs rsb rsc rsi rsk rsn rsr rss sbb sbc sbi sbk sbn sbr sbs scb scc sci sck scn scr scs sib sic sii sik sin sir sis sk- skb skc ski skk skr sks snb snc sni snk snn snr sns sr- srb src sri srk srn srr srs ss- ssb ssc ssi ssk ssn ssr sss