bbbb bbbs bblb bbls bffl bffs bfsi bfts bftt bibb bibi bibl bibo bibs biff bifi 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 boff bofs boi- boii boil bois boit boli boll bolo bols bolt boob boof bool boos boot bosi boso boss bost botb boti boto bots bott bsff bsfs bsos bsts btob btss bttb fbis ffff ffii ffss fftf fibs fiff fifi fifo fift fiii fiil fili fill filo fils fios fisi fiss fist fiti fits fitt flii flis flit flob floo flos flot flts fobs fobt fofo foil fois foli foll folo fols folt foof fool foos foot fosb fosi foso foss fost foti foto fots fott fsfi fsfo fssf ft-l ftii ftlb ftos ibfi ibis ibos ibot ibsf ibss ibtb ibtl ibts ifbb ifil ifis ifit ifsb ifso ifto 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 ioof iooi iooo ioos ioso iotf ioto isbl isbt isil isis isit isls iso- isof isol isos issf issi isso isss isti isto ists itbs itif itil itis itll itof itoi itol itoo itos itsf itsi itso ittf itto lbos lfts libo libs liff lifl lifo lift 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 loff lofi loft loif lois loit loli loll lolo lols loob loof lool loos loot losi loso loss lost loti lotl loto lots lott lsof lsso lsts ltbf ltbl ltib ltsi obbo obis obit obls oboi obol obos obot obss obst obts off- offo offs ofit ofst oiii oils oios oist oiti olbo olfs olib olio olis olit olli ollo olof olos olot olsi olst oobi ooff oofs oolo oooo ooos oosi oost ootb oots osii osis osli oslo osoi osoo osos ossb ossi osso osti osts otbs otif otis otit oto- otof otoo otos otso otti otto otts s-ib s-ii s-os sbbs sbot sbsi sbst sfio sfls sfos sfss sfts sibi sibo sibs siff sifl sifo sift siit sil- silf sili sill silo sils silt siol sios siot sisi siss sist sit- siti sito sits sitt sl-i slft slib slit slob sloo slos slot slst slts sobo sobs sobt sofi sofo soft soif soil sois soit solf soli soll solo sols solt soof sool soos soot sosi soso soss sost sotl soto sots ssfl ssis ssit sslt ssot sssb sssf sssi ssss sstb sstl ssts stbs stib stif stil stio stis stit stlo stlt stob stof stol stoo stos stot stsf stsi stss tbbs tbil tbit tbst tfot tfsi tfss tibi tibs tiff tifo tift tiit till tilo tils tilt tios tisb tisi tiso tiss tist titi tito tits titt tlli tlos tobi tobo tobs tobt toff tofi tofo toft toil tois toit tol- toli toll tolo tolt toof tool toos toot tosb tosi toso toss tost toti toto tots tott tsfl tsis tsob tsoi tsol tsos tssf tssi tsst tsts ttbb ttff ttss tttt