dddd ddot ddss ddts dfds dfdt dfts dntt dod- dodd dodo dods doff dond donn dono dons dont dood doof doon doos doot doso doss dost dotd doto dots dott dsos dssn dsst dstn dsto dsts dtot dtss fdos fdot fdst ffff ffss fftf fndd fndn fofo fond fono fons font food foof foon foos foot foso foss fost foto fots fott fsfo fssf ftos nddo ndnt ndos ndsf ndss nfff nfon nfto nnnn nnos nnot nnss nntn nodo nods non- nonn nono nons nont noo- noon nooo noos noot nos- noss nost not- noto nots nott nsdf nsds nsdt nsfs nsof nsos nssf nsso nsss nstd nsts ntds ntfs ntnd ntof ntsf ntss ntto oddd odds odon odoo odos odot odso odts off- offo offs ofno ofst ondo onno onod onon onos onso onst ont- onto ooff oofs oons oont oooo ooos oost oots osno osoo osos ossd osso osts oto- otof oton otoo otos otso otto otts s-os sdds sdot sdsf sdss sfnt sfos sfss sfts snns snod snoo snos snot snsd sodd sodo sods sofo soft son- sond sono sons sont sood soof soon soos soot soso soss sost sotn soto sots ssdd ssdf ssns ssot sssf ssss sstd ssts stds stfn stnd stnn stns stod stof ston stoo stos stot stsf stss sttd tdff tdss tfot tfsd tfss tndd tndf tnts todd todo tods todt toff tofo toft tonn tono tons tood toof toon toos toot toso toss tost totd toto tots tott tsos tssf tsst tsts ttff ttfn tton ttss tttt