dddd ddot ddss ddts dfds dfdt dfts dod- dodd dodo dods doff dood doof doos doot doso doss dost dotd doto dots dott dsos dsst dsto dsts dtot dtss fdos fdot fdst ffff ffss fftf fofo food foof foos foot foso foss fost foto fots fott fsfo fssf ftos oddd odds odoo odos odot odso odts off- offo offs ofst ooff oofs oooo ooos oost oots osoo osos ossd osso osts oto- otof otoo otos otso otto otts s-os sdds sdot sdsf sdss sfos sfss sfts sodd sodo sods sofo soft sood soof soos soot soso soss sost soto sots ssdd ssdf ssot sssf ssss sstd ssts stds stod stof stoo stos stot stsf stss sttd tdff tdss tfot tfsd tfss todd todo tods todt toff tofo toft tood toof toos toot toso toss tost totd toto tots tott tsos tssf tsst tsts ttff ttss tttt