-ol b-p bbb bbf bbi bbk bbl bbo bbp bbs bfb bff bfi bfl bfo bfp bfs bi- bib bif bii bik bil bio bip bis bkb bkf bkk bkl bko bkp bks blb blf bli blk bll blo blp bls bob bof boi bok bol boo bop bos bpb bpf bpi bpl bpo bpp bps bsb bsf bsi bsk bsl bso bsp bss fbb fbf fbi fbk fbl fbo fbp fbs fff ffi ffk ffl ffo ffp ffs fib fif fii fik fil fip fis fkb fkf fki fkk fkl fkp flb flf fli fll flo flp fls fob fof foi fok fol foo fop fos fpb fpi fpk fpl fpo fpp fps fsb fsf fsi fsk fsl fso fsp fss i-f ibb ibf ibi ibk ibl ibo ibp ibs ifb iff ifi ifl ifo ifp ifs iib iif iii iil iio iip iis ikb ikf iki ikk ikl iko iks il- ilb ilf ili ilk ill ilo ilp ils io- iob iof ioi iol ioo iop ios ipb ipf ipi ipl ipo ipp ips is- isb isf isi isk isl iso isp iss kbb kbf kbi kbk kbl kbo kbp kbs kff kfi kfo kfs kib kif kii kik kil kio kip kis kkb kki kkk kkl kkp kks kl- klb klf kli klo kls kob kof koi kok kol koo kop kos kpf kpi kpk kpl kpo kpp kps ksb ksf ksi ksk ksl kso ksp kss l-p lbb lbf lbi lbk lbl lbo lbp lbs lfb lff lfi lfk lfl lfo lfp lfs lib lif lii lik lil lio lip lis lkb lkl lkp lks llb llf lli llk lll llo llp lls lob lof loi lok lol loo lop los lpb lpf lpi lpk lpl lpo lpp lps lsb lsf lsi lsk lsl lso lsp lss o-i ob- obb obf obi obk obl obo obp obs of- ofb off ofi ofl ofo ofp ofs oib oif oii oik oil oio oip ois okb oki okk okl oko okp oks olb olf oli olk oll olo olp ols oo- oob oof ooi ook ool ooo oop oos op- opb opf opi opk opl opo opp ops os- osb osf osi osk osl oso osp oss p-p pbb pbf pbi pbk pbl pbo pbp pbs pfb pff pfi pfk pfl pfo pfp pfs pib pif pii pik pil pio pip pis pkb pkf pki pkl pko pkp pks plb plf pli plk pll plo plp pls pob pof poi pok pol poo pop pos ppb ppf ppi ppk ppl ppo ppp pps ps- psb psf psi psk psl pso psp pss sbb sbf sbi sbk sbl sbo sbp sbs sfb sff sfi sfk sfl sfo sfp sfs sib sif sii sik sil sio sip sis sk- skb skf ski skk skl sko skp sks slb slf sli slk sll slo slp sls sob sof soi sok sol soo sop sos spb spf spi spk spl spo spp sps ss- ssb ssf ssi ssk ssl sso ssp sss