bbbb bbbs bbdd bbdo bdii bdos bdsd bibb bibi bibo bibs bidi bido bids biis bio- bioi bios biot bis- bisd biso biss bist bitd bito bits bitt bobb bobi bobo bobs bodb bodi bodo bods boi- boid boii bois boit boob bood boos boot bosi boso boss bost botb botd boti boto bots bott bsbd bsod bsos bssd bsts btdt btob btss bttb d-bo dbit dbos dbss dbtt dddd ddot ddss ddts dibb dibo dibs didi dido dids diii diis dios diot dis- disd disi diso diss dist diti dito dits ditt dobb dobi dobs dod- dodd dodi dodo dods doid dois doit doob dood doos doot dosi doso doss dost dotd doti doto dots dott dsos dssi dsst dsto dsts dtot dtss ibdo ibid ibis ibos ibot ibss ibtb ibts iddo idid idio idis idos idso idss idts iiii iiio iiis iiit iioi iioo iios iisd iisi iist iitt iobi iod- iodd iodo ioii ioio ioit iooi iooo ioos ioso ioto isbd isbt isdb isds isis isit iso- isos issi isso isss istd isti isto ists itbs itdo itis itoi itoo itos itsi itso itto obbo obdt obid obis obit oboi obos obot obsd obss obst obtd obts odbo oddd oddi odds odio odis odoo odos odot odso odts oido oids oiii oios oisd oist oiti oobi oodi ooid oooo ooos oosi oost ootb oots osdi osii osis osoi osoo osos ossb ossd ossi osso osti osts otbd otbs otis otit oto- otoo otos otso otti otto otts s-ib s-ii s-os sbbs sbds sbot sbsd sbsi sbst sdds sdib sdio sdot sdss sibi sibo sibs sidd sidi sido sids siit siod sios siot sisd sisi siss sist sit- sitd siti sito sits sitt sobo sobs sobt sodd sodo sods sois soit sood soos soot sosi soso soss sost soto sots ssdd ssid ssis ssit ssot sssb sssi ssss sstb sstd ssts stbd stbs stds stib stid stio stis stit stob stod stoo stos stot stsi stss sttd tbbs tbit tbst tddb tdis tdss tibi tibs tidd tids tiit tios tisb tisi tiso tiss tist titi tito tits titt tobi tobo tobs tobt todd todi todo tods todt toid tois toit tood toos toot tosb tosi toso toss tost totd toti toto tots tott tsbd tsdb tsid tsis tsob tsoi tsos tssi tsst tsts ttbb ttss tttt