-ic bbb bbc bbi bbk bbl bbn bbr bbs bcb bcc bci bck bcl bcn bcr bcs bi- bib bic bii bik bil bin bir bis bkb bkc bkk bkl bkn bkr bks blb blc bli blk bll bln blr bls bnb bnc bni bnk bnl bnn bnr bns brb bri brk brl brn brr brs bsb bsc bsi bsk bsl bsn bsr bss c-- cbb cbc cbi cbk cbl cbn cbr cbs ccb ccc cci cck ccl ccn ccr ccs ci- cib cic cii cik cil cin cir cis ckb ckc cki cks cl- clb clc cli clk cll cln clr cls cn- cnb cnc cni cnl cnn cnr cns crb crc cri crk crl crn crr crs csb csc csi csk csl csn csr css ibb ibc ibi ibk ibl ibn ibr ibs icb icc ici ick icl icn icr ics iib iic iii iil iin iir iis ikb ikc iki ikk ikl ikr iks il- ilb ilc ili ilk ill iln ilr ils in- inb inc ini ink inl inn inr ins ir- irb irc iri irk irl irn irr irs is- isb isc isi isk isl isn isr iss kbb kbc kbi kbk kbl kbn kbr kbs kcb kcc kci kck kcl kcn kcr kcs kib kic kii kik kil kin kir kis kkb kkc kki kkk kkl kkn kkr kks kl- klb klc kli klr kls kn- knc kni knk knl knn knr krc kri krk krl krn krr krs ksb ksc ksi ksk ksl ksn ksr kss lbb lbc lbi lbk lbl lbr lbs lcb lcc lci lck lcl lcn lcr lcs lib lic lii lik lil lin lir lis lkb lkl lkr lks llb llc lli llk lll lln llr lls lnb lnc lni lnk lnl lnn lnr lns lrb lrc lri lrk lrn lrr lrs lsb lsc lsi lsk lsl lsn lsr lss n-i nbb nbc nbi nbk nbl nbn nbr nbs ncb ncc nci nck ncl ncn ncr ncs nib nic nii nik nil nin nir nis nkc nki nkk nkn nkr nks nlb nlc nli nlk nll nln nlr nls nnb nnc nni nnk nnl nnn nns nrb nrc nri nrk nrl nrn nrr nrs nsb nsc nsi nsk nsl nsn nsr nss rbb rbc rbi rbk rbl rbn rbr rbs rcb rcc rci rcl rcn rcr rcs rib ric rii rik ril rin rir ris rkb rkc rkk rks rlc rli rll rln rlr rls rnb rnc rni rnn rnr rns rrb rrc rri rrk rrl rrn rrr rrs rsb rsc rsi rsk rsl rsn rsr rss sbb sbc sbi sbk sbl sbn sbr sbs scb scc sci sck scl scn scr scs sib sic sii sik sil sin sir sis sk- skb skc ski skk skl skr sks slb slc sli slk sll sln slr sls snb snc sni snk snl snn snr sns sr- srb src sri srk srl srn srr srs ss- ssb ssc ssi ssk ssl ssn ssr sss