-ol bbb bbe bbi bbl bbo bbx be- beb bee bei bel beo bev bex bi- bib bie bii bil bio biv bix blb ble bli bll blo blv blx bob boe boi bol boo bov box bvb bve bvi bvl bvo bvv bxb bxi bxl bxo bxx ebb ebe ebi ebl ebo ebv ebx eeb eee eel eeo eev eex eib eie eii eil eio eiv eix elb ele eli ell elo elv elx eo- eob eoe eoi eol eoo evb eve evi evl evo evv ex- exe exi exl exo exx i-v ibb ibe ibi ibl ibo ibv ibx ie- iee iei iel iev iex iib iie iii iil iio iix il- ilb ile ili ill ilo ilv ilx io- iob ioe ioi iol ioo iov ivb ive ivi ivl ivo ivv ivx ixe ixi ixl lbb lbe lbi lbl lbo lbv lbx leb lee lei lel leo lev lex lib lie lii lil lio liv lix llb lle lli lll llo llv lob loe loi lol loo lov lox lvb lve lvi lvl lvv lvx lxi lxo lxv lxx o-i ob- obb obe obi obl obo obv obx oeb oee oei oel oeo oex oib oie oii oil oio oiv olb ole oli oll olo oo- oob ooi ool ooo oov oox ov- ovb ove ovi ovl ovo ovv ox- oxb oxi oxo oxx v-e vbi vbl vbo vbv veb vee vei vel veo vex vi- vib vie vii vil vio viv vix vl- vlb vle vll vlo vlv vob voe voi vol voo vov vox vvb vvi vvo vvv vxl vxv xbe xbl xbx xee xel xev xex xie xii xio xiv xix xlb xli xlv xoi xoo xov xox xvi xvl xxi xxl xxo xxv xxx