-ol b-p bbb bbf bbi bbk bbl bbo bbp bbr bbs bfb bff bfi bfl bfo bfp bfr bfs bi- bib bif bii bik bil bio bip bir bis bkb bkf bkk bkl bko bkp bkr bks blb blf bli blk bll blo blp blr bls bob bof boi bok bol boo bop bor bos bpb bpf bpi bpl bpo bpp bpr bps brb brf bri brk brl bro brp brr brs bsb bsf bsi bsk bsl bso bsp bsr bss fbb fbf fbi fbk fbl fbo fbp fbr fbs fff ffi ffk ffl ffo ffp ffr ffs fib fif fii fik fil fip fir fis fkb fkf fki fkk fkl fkp flb flf fli fll flo flp flr fls fob fof foi fok fol foo fop for fos fpb fpi fpk fpl fpo fpp fpr fps frb frf fri frk frl fro frp frr frs fsb fsf fsi fsk fsl fso fsp fsr fss i-f ibb ibf ibi ibk ibl ibo ibp ibr ibs ifb iff ifi ifl ifo ifp ifr ifs iib iif iii iil iio iip iir iis ikb ikf iki ikk ikl iko ikr iks il- ilb ilf ili ilk ill ilo ilp ilr ils io- iob iof ioi iol ioo iop ior ios ipb ipf ipi ipl ipo ipp ipr ips ir- irb irf iri irk irl iro irp irr irs is- isb isf isi isk isl iso isp isr iss kbb kbf kbi kbk kbl kbo kbp kbr kbs kff kfi kfo kfs kib kif kii kik kil kio kip kir kis kkb kki kkk kkl kkp kkr kks kl- klb klf kli klo klr kls kob kof koi kok kol koo kop kor kos kpf kpi kpk kpl kpo kpp kpr kps krf kri krk krl kro krp krr krs ksb ksf ksi ksk ksl kso ksp ksr kss l-p lbb lbf lbi lbk lbl lbo lbp lbr lbs lfb lff lfi lfk lfl lfo lfp lfr lfs lib lif lii lik lil lio lip lir lis lkb lkl lkp lkr lks llb llf lli llk lll llo llp llr lls lob lof loi lok lol loo lop lor los lpb lpf lpi lpk lpl lpo lpp lpr lps lrb lrf lri lrk lro lrp lrr lrs lsb lsf lsi lsk lsl lso lsp lsr lss o-i ob- obb obf obi obk obl obo obp obr obs of- ofb off ofi ofl ofo ofp ofr ofs oib oif oii oik oil oio oip oir ois okb oki okk okl oko okp okr oks olb olf oli olk oll olo olp ols oo- oob oof ooi ook ool ooo oop oor oos op- opb opf opi opk opl opo opp opr ops or- orb orf ori ork orl oro orp orr ors os- osb osf osi osk osl oso osp osr oss p-p pbb pbf pbi pbk pbl pbo pbp pbr pbs pfb pff pfi pfk pfl pfo pfp pfr pfs pib pif pii pik pil pio pip pir pis pkb pkf pki pkl pko pkp pkr pks plb plf pli plk pll plo plp plr pls pob pof poi pok pol poo pop por pos ppb ppf ppi ppk ppl ppo ppp ppr pps prb prf pri prk prl pro prp prr prs ps- psb psf psi psk psl pso psp psr pss rbb rbf rbi rbk rbl rbo rbp rbr rbs rfb rff rfi rfk rfl rfo rfp rfr rfs rib rif rii rik ril rio rip rir ris rkb rkf rkk rko rkp rks rlf rli rll rlo rlp rlr rls rob rof roi rok rol roo rop ror ros rpb rpf rpi rpk rpl rpo rpp rpr rps rrb rrf rri rrk rrl rrp rrr rrs rsb rsf rsi rsk rsl rso rsp rsr rss sbb sbf sbi sbk sbl sbo sbp sbr sbs sfb sff sfi sfk sfl sfo sfp sfr sfs sib sif sii sik sil sio sip sir sis sk- skb skf ski skk skl sko skp skr sks slb slf sli slk sll slo slp slr sls sob sof soi sok sol soo sop sor sos spb spf spi spk spl spo spp spr sps sr- srb srf sri srk srl sro srp srr srs ss- ssb ssf ssi ssk ssl sso ssp ssr sss