-er -ol b-p bbb bbe bbk bbl bbo bbp bbr bbs be- beb bee bek bel beo bep ber bes bkb bke bkk bkl bko bkp bkr bks blb ble blk bll blo blp blr bls bob boe bok bol boo bop bor bos bpb bpe bpl bpo bpp bpr bps brb bre brk brl bro brp brr brs bsb bse bsk bsl bso bsp bsr bss ebb ebe ebk ebl ebo ebp ebr ebs eeb eee eek eel eeo eep eer ees ekb eke ekl eko ekp ekr eks elb ele elk ell elo elp elr els eo- eob eoe eok eol eoo eop eor eos ep- epb epe epl epo epp epr eps erb ere erk erl ero erp err ers es- esb ese esk esl eso esp esr ess kbb kbe kbk kbl kbo kbp kbr kbs ke- keb kee kek kel keo kep ker kes kkb kke kkk kkl kkp kkr kks kl- klb klo klr kls kob koe kok kol koo kop kor kos kpe kpk kpl kpo kpp kpr kps krk krl kro krp krr krs ksb kse ksk ksl kso ksp ksr kss l-p lbb lbe lbk lbl lbo lbp lbr lbs leb lee lek lel leo lep ler les lkb lkl lkp lkr lks llb lle llk lll llo llp llr lls lob loe lok lol loo lop lor los lpb lpe lpk lpl lpo lpp lpr lps lrb lrk lro lrp lrr lrs lsb lse lsk lsl lso lsp lsr lss ob- obb obe obk obl obo obp obr obs oeb oee oel oeo oep oer oes okb oke okk okl oko okp okr oks olb ole olk oll olo olp ols oo- oob ook ool ooo oop oor oos op- opb ope opk opl opo opp opr ops or- orb ore ork orl oro orp orr ors os- osb ose osk osl oso osp osr oss p-p pbb pbe pbk pbl pbo pbp pbr pbs peb pee pek pel peo pep per pes pkb pke pkl pko pkp pkr pks plb ple plk pll plo plp plr pls pob poe pok pol poo pop por pos ppb ppe ppk ppl ppo ppp ppr pps prb pre prk prl pro prp prr prs ps- psb pse psk psl pso psp psr pss rbb rbe rbk rbl rbo rbp rbr rbs re- reb ree rek rel reo rep rer res rkb rke rkk rko rkp rks rle rll rlo rlp rlr rls rob roe rok rol roo rop ror ros rpb rpe rpk rpl rpo rpp rpr rps rrb rrk rrl rrp rrr rrs rsb rse rsk rsl rso rsp rsr rss sbb sbe sbk sbl sbo sbp sbr sbs se- seb see sek sel seo sep ser ses sk- skb ske skk skl sko skp skr sks slb sle slk sll slo slp slr sls sob soe sok sol soo sop sor sos spb spe spk spl spo spp spr sps sr- srb sre srk srl sro srp srr srs ss- ssb sse ssk ssl sso ssp ssr sss