-ol bbb bbd bbf bbk bbl bbo bbs bdb bdd bdf bdk bdl bdo bds bfb bfd bff bfl bfo bfs bkb bkf bkk bkl bko bks blb bld blf blk bll blo bls bob bod bof bok bol boo bos bsb bsd bsf bsk bsl bso bss dbb dbd dbf dbk dbl dbo dbs ddb ddd ddf ddk ddl ddo dds dfb dfd dff dfk dfl dfo dfs dkb dkk dkl dko dks dl- dlb dld dlf dlk dll dlo dls dob dod dof dok dol doo dos dsb dsd dsf dsk dsl dso dss fbb fbd fbf fbk fbl fbo fbs fdb fdd fdf fdk fdl fdo fds ffd fff ffk ffl ffo ffs fkb fkf fkk fkl flb fld flf fll flo fls fob fof fok fol foo fos fsb fsd fsf fsk fsl fso fss kbb kbd kbf kbk kbl kbo kbs kdb kdf kdk kdl kdo kds kfd kff kfo kfs kkb kkk kkl kks kl- klb kld klf klo kls kob kod kof kok kol koo kos ksb ksd ksf ksk ksl kso kss lbb lbd lbf lbk lbl lbo lbs ldb ldd ldf ldk ldl ldo lds lfb lfd lff lfk lfl lfo lfs lkb lkl lks llb lld llf llk lll llo lls lob lod lof lok lol loo los lsb lsd lsf lsk lsl lso lss ob- obb obd obf obk obl obo obs odb odd odf odl odo ods of- ofb ofd off ofl ofo ofs okb okd okk okl oko oks olb old olf olk oll olo ols oo- oob ood oof ook ool ooo oos os- osb osd osf osk osl oso oss sbb sbd sbf sbk sbl sbo sbs sdb sdd sdf sdk sdl sdo sds sfb sfd sff sfk sfl sfo sfs sk- skb skd skf skk skl sko sks slb sld slf slk sll slo sls sob sod sof sok sol soo sos ss- ssb ssd ssf ssk ssl sso sss