-er -ol bbb bbc bbe bbk bbl bbo bbr bbs bcb bcc bce bck bcl bco bcr bcs bcz be- beb bec bee bek bel beo ber bes bez bkb bkc bke bkk bkl bko bkr bks blb blc ble blk bll blo blr bls blz bob boc boe bok bol boo bor bos boz brb bre brk brl bro brr brs brz bsb bsc bse bsk bsl bso bsr bss bze bzo bzr bzs bzz c-- cbb cbc cbe cbk cbl cbo cbr cbs cbz ccb ccc cce cck ccl cco ccr ccs ccz ce- ceb cec cee cek cel ceo cer ces cez ckb ckc cko cks cl- clb clc cle clk cll clo clr cls clz co- cob coc coe cok col coo cor cos coz crb crc cre crk crl cro crr crs crz csb csc cse csk csl cso csr css csz cz- czc cze czk czo ebb ebc ebe ebk ebl ebo ebr ebs ec- ecb ecc ece eck ecl eco ecr ecs eeb eec eee eek eel eeo eer ees ekb ekc eke ekl eko ekr eks elb elc ele elk ell elo elr els elz eo- eob eoc eoe eok eol eoo eor eos erb erc ere erk erl ero err ers erz es- esb esc ese esk esl eso esr ess eze ezo ezr ezs ezz k-z kbb kbc kbe kbk kbl kbo kbr kbs kbz kcb kcc kce kck kcl kcr kcs ke- keb kec kee kek kel keo ker kes kez kkb kkc kke kkk kkl kkr kks kl- klb klc klo klr kls klz kob koc koe kok kol koo kor kos koz krc krk krl kro krr krs ksb ksc kse ksk ksl kso ksr kss kzo lbb lbc lbe lbk lbl lbo lbr lbs lcb lcc lce lck lcl lco lcr lcs leb lec lee lek lel leo ler les lez lkb lkl lkr lks llb llc lle llk lll llo llr lls llz lob loc loe lok lol loo lor los loz lrb lrc lrk lro lrr lrs lrz lsb lsc lse lsk lsl lso lsr lss lsz lzo lzr lzs ob- obb obc obe obk obl obo obr obs oc- ocb occ ock ocl oco ocr ocs ocz oeb oec oee oel oeo oer oes okb okc oke okk okl oko okr oks olb olc ole olk oll olo ols oo- oob ooc ook ool ooo oor oos or- orb orc ore ork orl oro orr ors orz os- osb osc ose osk osl oso osr oss oze ozo ozs ozz rbb rbc rbe rbk rbl rbo rbr rbs rcb rcc rce rcl rco rcr rcs re- reb rec ree rek rel reo rer res rez rkb rkc rke rkk rko rks rkz rlc rle rll rlo rlr rls rob roc roe rok rol roo ror ros roz rrb rrc rrk rrl rrr rrs rsb rsc rse rsk rsl rso rsr rss rzb rze rzo sbb sbc sbe sbk sbl sbo sbr sbs scb scc sce sck scl sco scr scs se- seb sec see sek sel seo ser ses sez sk- skb skc ske skk skl sko skr sks slb slc sle slk sll slo slr sls sob soc soe sok sol soo sor sos soz sr- srb src sre srk srl sro srr srs ss- ssb ssc sse ssk ssl sso ssr sss ssz sze szl szr zbb zbc zbl zbr zbs zce zcl zco zcs zeb zec zee zek zel zeo zer zes zez zks zlr zo- zob zoc zoe zok zol zoo zor zos zrl zro zrs zse zsl zsz zzr zzs zzz