-ol b-p bbb bbf bbi bbk bbl bbo bbp bfb bff bfi bfl bfo bfp bi- bib bif bii bik bil bio bip bkb bkf bkk bkl bko bkp blb blf bli blk bll blo blp bob bof boi bok bol boo bop bpb bpf bpi bpl bpo bpp fbb fbf fbi fbk fbl fbo fbp fff ffi ffk ffl ffo ffp fib fif fii fik fil fip fkb fkf fki fkk fkl fkp flb flf fli fll flo flp fob fof foi fok fol foo fop fpb fpi fpk fpl fpo fpp i-f ibb ibf ibi ibk ibl ibo ibp ifb iff ifi ifl ifo ifp iib iif iii iil iio iip ikb ikf iki ikk ikl iko il- ilb ilf ili ilk ill ilo ilp io- iob iof ioi iol ioo iop ipb ipf ipi ipl ipo ipp kbb kbf kbi kbk kbl kbo kbp kff kfi kfo kib kif kii kik kil kio kip kkb kki kkk kkl kkp kl- klb klf kli klo kob kof koi kok kol koo kop kpf kpi kpk kpl kpo kpp l-p lbb lbf lbi lbk lbl lbo lbp lfb lff lfi lfk lfl lfo lfp lib lif lii lik lil lio lip lkb lkl lkp llb llf lli llk lll llo llp lob lof loi lok lol loo lop lpb lpf lpi lpk lpl lpo lpp o-i ob- obb obf obi obk obl obo obp of- ofb off ofi ofl ofo ofp oib oif oii oik oil oio oip okb oki okk okl oko okp olb olf oli olk oll olo olp oo- oob oof ooi ook ool ooo oop op- opb opf opi opk opl opo opp p-p pbb pbf pbi pbk pbl pbo pbp pfb pff pfi pfk pfl pfo pfp pib pif pii pik pil pio pip pkb pkf pki pkl pko pkp plb plf pli plk pll plo plp pob pof poi pok pol poo pop ppb ppf ppi ppk ppl ppo ppp