bbbb bbbs bblb bbls bibb bibi bibl bibo bibs biis bili bill bilo bils bilt bio- bioi biol bios biot bis- bisl biso biss bist bito bits bitt blbt blio blis blit blls blob bloo blot blss blst blts bobb bobi bobo bobs boi- boii boil bois boit boli boll bolo bols bolt boob bool boos boot bosi boso boss bost botb boti boto bots bott bsos bsts btob btss bttb ibis ibos ibot ibss ibtb ibtl ibts iiii iiio iiis iiit iioi iioo iios iisi iist iitt ilio ilis ilit ill- illi illo ills illt iloo ilos ilot ilts iobi ioii ioio ioit iolo iooi iooo ioos ioso ioto isbl isbt isil isis isit isls iso- isol isos issi isso isss isti isto ists itbs itil itis itll itoi itol itoo itos itsi itso itto lbos libo libs liii liis lilb lili lill lilo lils lilt lio- lios lisi liso liss list litb liti litl lito lits litt llbs llll lloo lob- lobb lobi lobo lobs lois loit loli loll lolo lols loob lool loos loot losi loso loss lost loti lotl loto lots lott lsso lsts ltbl ltib ltsi obbo obis obit obls oboi obol obos obot obss obst obts oiii oils oios oist oiti olbo olib olio olis olit olli ollo olos olot olsi olst oobi oolo oooo ooos oosi oost ootb oots osii osis osli oslo osoi osoo osos ossb ossi osso osti osts otbs otis otit oto- otoo otos otso otti otto otts s-ib s-ii s-os sbbs sbot sbsi sbst sibi sibo sibs siit sil- sili sill silo sils silt siol sios siot sisi siss sist sit- siti sito sits sitt sl-i slib slit slob sloo slos slot slst slts sobo sobs sobt soil sois soit soli soll solo sols solt sool soos soot sosi soso soss sost sotl soto sots ssis ssit sslt ssot sssb sssi ssss sstb sstl ssts stbs stib stil stio stis stit stlo stlt stob stol stoo stos stot stsi stss tbbs tbil tbit tbst tibi tibs tiit till tilo tils tilt tios tisb tisi tiso tiss tist titi tito tits titt tlli tlos tobi tobo tobs tobt toil tois toit tol- toli toll tolo tolt tool toos toot tosb tosi toso toss tost toti toto tots tott tsis tsob tsoi tsol tsos tssi tsst tsts ttbb ttss tttt