bbbb bblb bbox bibb bibi bibl bibo bili bill bilo bilt bio- bioi biol biot biox bito bitt bitx bixi blbt blio blit blix blob bloo blot bobb bobi bobo boi- boii boil boit boli boll bolo bolt boob bool boot boox botb boti boto bott btob bttb ibot ibox ibtb ibtl iiii iiio iiit iioi iioo iitt ilbx ilio ilit ill- illi illo illt iloo ilot ilxx iobi ioii ioio ioit iolo iooi iooo ioto itil itll itoi itol itoo itto ixil ixxi libo libx liii lilb lili lill lilo lilt lio- litb liti litl lito litt lixi lixt llll lloo lob- lobb lobi lobo loit loix loli loll lolo loob lool loot loti lotl loto lott lox- loxo ltbl ltib lxii lxxi lxxx obbo obit obix oboi obol obot obox oiii oiti olbo olib olio olit olli ollo olot oobi oolo oooo ootb otit oto- otoo otti otto oxi- oxo- oxox oxxo tbil tbit tbox tibi tiit till tilo tilt titi tito titt tixt tlli tltx tobi tobo tobt toil toit tol- toli toll tolo tolt tool toot toti toto tott tox- toxi toxo toxt ttbb tttt txii xbox xibo xiii xil- xili xill xito xixi xlib xlii xlix xlox xolo xoxo xtol xxii xxix xxxi xxxo xxxx