-ol bbb bbi bbk bbl bbo bbs bi- bib bii bik bil bio bis bkb bkk bkl bko bks blb bli blk bll blo bls bob boi bok bol boo bos bsb bsi bsk bsl bso bss ibb ibi ibk ibl ibo ibs iib iii iil iio iis ikb iki ikk ikl iko iks il- ilb ili ilk ill ilo ils io- iob ioi iol ioo ios is- isb isi isk isl iso iss kbb kbi kbk kbl kbo kbs kib kii kik kil kio kis kkb kki kkk kkl kks kl- klb kli klo kls kob koi kok kol koo kos ksb ksi ksk ksl kso kss lbb lbi lbk lbl lbo lbs lib lii lik lil lio lis lkb lkl lks llb lli llk lll llo lls lob loi lok lol loo los lsb lsi lsk lsl lso lss o-i ob- obb obi obk obl obo obs oib oii oik oil oio ois okb oki okk okl oko oks olb oli olk oll olo ols oo- oob ooi ook ool ooo oos os- osb osi osk osl oso oss sbb sbi sbk sbl sbo sbs sib sii sik sil sio sis sk- skb ski skk skl sko sks slb sli slk sll slo sls sob soi sok sol soo sos ss- ssb ssi ssk ssl sso sss