bbbb bbeb bblb bbox bebb bebe bebi bebo beeb beel beil bele beli bell belo beo- bibb bibe bibi bibl bibo bieb biel bile bili bill bilo bio- bioi biol biox bixi bleb blee blei bleo blio blix blob bloo bobb bobe bobi bobo boee boel boeo boi- boie boii boil bole boli boll bolo boob booe bool boox ebbo ebel ebix ebli eboe ebol eboo ebox eeee eele eiei eile el-b elbe elbi elbo elee eleo elex elie elil elio elix elle elli ello eloi eole eoli eolo exel exo- i-be ibex ibie ible ibox ieie ieio iele iiie iiii iiio iioi iioo ilbx ile- ileo ilex ilie ilio ill- ille illi illo iloo ilxx iobi ioee ioel ioii ioio iole iolo iooi iooo ixil ixxi lebo leel leib leie leil leio leix lele leli lell lelo leoi leox lexi lexx libe libo libx lieb liel liii lilb lile lili lill lilo lio- lixi llll lloo lob- lobb lobe lobi lobo loeb loei loix lole loli loll lolo loob looe lool lox- loxo lxii lxxi lxxx o-eo obbo obel obex obie obix oble oboe oboi obol obox oeil oele oiii olbo ole- olei oleo olib olie olio olle olli ollo oobe oobi oolo oooo oxi- oxie oxo- oxox oxxo xbee xbel xbox xexe xibe xibo xiii xil- xili xill xixi xlib xlii xlix xlox xolo xoxo xxii xxix xxxi xxxo xxxx