-ol b-u bbb bbe bbl bbo bbu bbx be- beb bee bel beo beu bex blb ble bll blo blu blx bob boe bol boo bou box bub bue bul buo buu bux bxb bxl bxo bxx ebb ebe ebl ebo ebu ebx eeb eee eel eeo eex elb ele ell elo elu elx eo- eob eoe eol eoo eou eu- eub eue eul eux ex- exe exl exo exu exx lbb lbe lbl lbo lbu lbx leb lee lel leo leu lex llb lle lll llo llu lob loe lol loo lou lox lub lue lul luo luu lux lxo lxx ob- obb obe obl obo obu obx oeb oee oel oeo oex olb ole oll olo olu oo- oob ool ooo oox ou- oue oul ouo ox- oxb oxo oxx ubb ube ubl ubo ubu ubx ueb uee uel ulb ule ull ulo ulu uob uoe uol uoo uox uue uuu uxb uxo uxu xbe xbl xbx xee xel xeu xex xlb xoo xox xue xul xxl xxo xxx