-ic -ol bbb bbc bbi bbk bbl bbo bbr bbs bcb bcc bci bck bcl bco bcr bcs bi- bib bic bii bik bil bio bir bis bkb bkc bkk bkl bko bkr bks blb blc bli blk bll blo blr bls bob boc boi bok bol boo bor bos brb bri brk brl bro brr brs bsb bsc bsi bsk bsl bso bsr bss c-- cbb cbc cbi cbk cbl cbo cbr cbs ccb ccc cci cck ccl cco ccr ccs ci- cib cic cii cik cil cio cir cis ckb ckc cki cko cks cl- clb clc cli clk cll clo clr cls co- cob coc coi cok col coo cor cos crb crc cri crk crl cro crr crs csb csc csi csk csl cso csr css ibb ibc ibi ibk ibl ibo ibr ibs icb icc ici ick icl ico icr ics iib iic iii iil iio iir iis ikb ikc iki ikk ikl iko ikr iks il- ilb ilc ili ilk ill ilo ilr ils io- iob ioc ioi iol ioo ior ios ir- irb irc iri irk irl iro irr irs is- isb isc isi isk isl iso isr iss kbb kbc kbi kbk kbl kbo kbr kbs kcb kcc kci kck kcl kcr kcs kib kic kii kik kil kio kir kis kkb kkc kki kkk kkl kkr kks kl- klb klc kli klo klr kls kob koc koi kok kol koo kor kos krc kri krk krl kro krr krs ksb ksc ksi ksk ksl kso ksr kss lbb lbc lbi lbk lbl lbo lbr lbs lcb lcc lci lck lcl lco lcr lcs lib lic lii lik lil lio lir lis lkb lkl lkr lks llb llc lli llk lll llo llr lls lob loc loi lok lol loo lor los lrb lrc lri lrk lro lrr lrs lsb lsc lsi lsk lsl lso lsr lss o-i ob- obb obc obi obk obl obo obr obs oc- ocb occ oci ock ocl oco ocr ocs oib oic oii oik oil oio oir ois okb okc oki okk okl oko okr oks olb olc oli olk oll olo ols oo- oob ooc ooi ook ool ooo oor oos or- orb orc ori ork orl oro orr ors os- osb osc osi osk osl oso osr oss rbb rbc rbi rbk rbl rbo rbr rbs rcb rcc rci rcl rco rcr rcs rib ric rii rik ril rio rir ris rkb rkc rkk rko rks rlc rli rll rlo rlr rls rob roc roi rok rol roo ror ros rrb rrc rri rrk rrl rrr rrs rsb rsc rsi rsk rsl rso rsr rss sbb sbc sbi sbk sbl sbo sbr sbs scb scc sci sck scl sco scr scs sib sic sii sik sil sio sir sis sk- skb skc ski skk skl sko skr sks slb slc sli slk sll slo slr sls sob soc soi sok sol soo sor sos sr- srb src sri srk srl sro srr srs ss- ssb ssc ssi ssk ssl sso ssr sss