-ol bbb bbe bbi bbl bbo bbx be- beb bee bei bel beo bex bi- bib bie bii bil bio bix blb ble bli bll blo blx bob boe boi bol boo box bxb bxi bxl bxo bxx ebb ebe ebi ebl ebo ebx eeb eee eel eeo eex eib eie eii eil eio eix elb ele eli ell elo elx eo- eob eoe eoi eol eoo ex- exe exi exl exo exx ibb ibe ibi ibl ibo ibx ie- iee iei iel iex iib iie iii iil iio iix il- ilb ile ili ill ilo ilx io- iob ioe ioi iol ioo ixe ixi ixl lbb lbe lbi lbl lbo lbx leb lee lei lel leo lex lib lie lii lil lio lix llb lle lli lll llo lob loe loi lol loo lox lxi lxo lxx o-i ob- obb obe obi obl obo obx oeb oee oei oel oeo oex oib oie oii oil oio olb ole oli oll olo oo- oob ooi ool ooo oox ox- oxb oxi oxo oxx xbe xbl xbx xee xel xex xie xii xio xix xlb xli xoi xoo xox xxi xxl xxo xxx