-ol bbb bbe bbi bbk bbl bbo bbs be- beb bee bei bek bel beo bes bi- bib bie bii bik bil bio bis bkb bke bkk bkl bko bks blb ble bli blk bll blo bls bob boe boi bok bol boo bos bsb bse bsi bsk bsl bso bss ebb ebe ebi ebk ebl ebo ebs eeb eee eek eel eeo ees eib eie eii eik eil eio eis ekb eke eki ekl eko eks elb ele eli elk ell elo els eo- eob eoe eoi eok eol eoo eos es- esb ese esi esk esl eso ess ibb ibe ibi ibk ibl ibo ibs ie- iee iei iek iel ies iib iie iii iil iio iis ikb ike iki ikk ikl iko iks il- ilb ile ili ilk ill ilo ils io- iob ioe ioi iol ioo ios is- isb ise isi isk isl iso iss kbb kbe kbi kbk kbl kbo kbs ke- keb kee kei kek kel keo kes kib kie kii kik kil kio kis kkb kke kki kkk kkl kks kl- klb kli klo kls kob koe koi kok kol koo kos ksb kse ksi ksk ksl kso kss lbb lbe lbi lbk lbl lbo lbs leb lee lei lek lel leo les lib lie lii lik lil lio lis lkb lkl lks llb lle lli llk lll llo lls lob loe loi lok lol loo los lsb lse lsi lsk lsl lso lss o-i ob- obb obe obi obk obl obo obs oeb oee oei oel oeo oes oib oie oii oik oil oio ois okb oke oki okk okl oko oks olb ole oli olk oll olo ols oo- oob ooi ook ool ooo oos os- osb ose osi osk osl oso oss sbb sbe sbi sbk sbl sbo sbs se- seb see sei sek sel seo ses sib sie sii sik sil sio sis sk- skb ske ski skk skl sko sks slb sle sli slk sll slo sls sob soe soi sok sol soo sos ss- ssb sse ssi ssk ssl sso sss