-ol bbb bbe bbk bbl bbn bbo bbx be- beb bee bek bel ben beo bex bkb bke bkk bkl bkn bko bkx blb ble blk bll bln blo blx bnb bne bnk bnl bnn bno bnx bob boe bok bol bon boo box bxb bxl bxn bxo bxx ebb ebe ebk ebl ebn ebo ebx eeb eee eek eel een eeo eex ekb eke ekl eko elb ele elk ell eln elo elx en- enb ene enk enl enn eno eo- eob eoe eok eol eon eoo ex- exe exl exo exx kbb kbe kbk kbl kbn kbo kbx ke- keb kee kek kel ken keo kex kkb kke kkk kkl kkn kl- klb klo klx kn- kne knk knl knn kno knx kob koe kok kol kon koo kxl kxo lbb lbe lbk lbl lbo lbx leb lee lek lel len leo lex lkb lkl llb lle llk lll lln llo lnb lne lnk lnl lnn lno lob loe lok lol lon loo lox lxo lxx nbb nbe nbk nbl nbn nbo nbx ne- neb nee nek nel nen neo nex nke nkk nkn nko nlb nle nlk nll nln nlo nlx nnb nne nnk nnl nnn nno no- nob noe nok nol non noo nox nxl ob- obb obe obk obl obn obo obx oeb oee oel oen oeo oex okb oke okk okl oko olb ole olk oll oln olo on- onb one onk onl onn ono onx oo- oob ook ool oon ooo oox ox- oxb oxn oxo oxx xbe xbl xbx xee xel xen xex xkb xke xkl xlb xnk xno xok xon xoo xox xxl xxo xxx