-ol bbb bbe bbi bbk bbl bbo bbx be- beb bee bei bek bel beo bex bi- bib bie bii bik bil bio bix bkb bke bkk bkl bko bkx blb ble bli blk bll blo blx bob boe boi bok bol boo box bxb bxi bxl bxo bxx ebb ebe ebi ebk ebl ebo ebx eeb eee eek eel eeo eex eib eie eii eik eil eio eix ekb eke eki ekl eko elb ele eli elk ell elo elx eo- eob eoe eoi eok eol eoo ex- exe exi exl exo exx ibb ibe ibi ibk ibl ibo ibx ie- iee iei iek iel iex iib iie iii iil iio iix ikb ike iki ikk ikl iko ikx il- ilb ile ili ilk ill ilo ilx io- iob ioe ioi iol ioo ixe ixi ixl kbb kbe kbi kbk kbl kbo kbx ke- keb kee kei kek kel keo kex kib kie kii kik kil kio kix kkb kke kki kkk kkl kl- klb kli klo klx kob koe koi kok kol koo kxl kxo lbb lbe lbi lbk lbl lbo lbx leb lee lei lek lel leo lex lib lie lii lik lil lio lix lkb lkl llb lle lli llk lll llo lob loe loi lok lol loo lox lxi lxo lxx o-i ob- obb obe obi obk obl obo obx oeb oee oei oel oeo oex oib oie oii oik oil oio okb oke oki okk okl oko olb ole oli olk oll olo oo- oob ooi ook ool ooo oox ox- oxb oxi oxo oxx xbe xbl xbx xee xel xex xie xii xio xix xkb xke xkl xlb xli xoi xok xoo xox xxi xxl xxo xxx