dddd ddot ddss ddts dfds dfdt dfrf dftr dfts dod- dodd dodo dods doff dood doof door doos doot dord dorf doro dorr dors dort doso doss dost dotd doto dots dott drod drof drot drrs dsdr dsos dsrr dsst dsto dsts dtor dtot dtss fdos fdot fdst ffff ffrr ffss fftf fofo food foof foos foot for- ford foro forr fors fort foso foss fost foto fots fott fros frot frso frst fsfo fssf ftos ftrs ftsr oddd odds odoo odor odos odot odso odts ofdr off- offo offr offs ofor ofst ooff oofs oooo ooos oord oort oost oots ordo ords orff orfs oro- orof oror oros orot orro orrs orso orto orts osoo osor osos osrd osro ossd osso ostr osts oto- otof otoo otor otos otro otrs otso otto otts rdos rdso rfds rodd rodo rods roff rofo rood roof roor roos root roro rort roso ross rost roto rotr rots rott rrrr rsdd rsds rsos rsts rtdt rtss rtts s-os sdds sdot sdrs sdsf sdss sfor sfos sfro sfss sfts sodd sodo sods sofo soft sood soof soor soos soot sord soro sorr sors sort soso soss sost soto sots sros srsd srtr ssdd ssdf ssot ssrs sssf ssss sstd ssts stds stod stof stoo stor stos stot strd stro strs stsf stss sttd sttr tdff tdor tdss tfot tfrs tfsd tfss todd todo tods todt toff tofo toft tood toof toor toos toot tord torf toro torr tors tort toso toss tost totd toto totr tots tott trfd trfr trod troo tros trot trsd trst trtr tsos tssf tssr tsst tsts ttff ttss tttt