dddd ddot ddre dedd dede dedo dedu deed deef deer deet defe deff defo deft deor der- dere derf dero derr dete deto detr deue deur deut dfdt dfer dfoe dfrf dftr dod- dodd dode dodo doer doff dood doof door doot dord dore dorf doro dorr dort doru dotd dote doto dott doud doue douf dour dout dred dree dref dret drod drof drot drou drue drut druu dted dtor dtot dudd dude dudo dudu duer duet duff dufu duo- dure duro durt duru dute duur duut edde eddo ede- eder edfu edod edou edru edur eede eedu eeee eefe eero eete eetu efeo efet efor eft- eftu eode eore eotd eoto erde erdf ered erer eret erft erod eroe eroo erre erro ertu erur etee eter etfe etoe etre etro ette etto ettu eude euer eur- eure euro eurt fdot fede feed feer feet fefe feff fefo feod feof ferd fere fero ferr fert feru fete fetr fett fetu feud ffee ffff ffrr fftf fode foed foer fofo food foof foot for- ford fore foro forr fort fote foto fott foud four fout fred free freo fret froe frot frou frue fter fudd fude fuet fuff fufu fuor fur- fure furo furr furt fute futo futu o-eo oddd oded odeo oder odet odoo odor odot odou odtu odur oedo oere oeuf ofdr ofer off- offe offo offr offu ofor ofre ooer ooff oooo oord oore oort orde ordo ordu ore- ored oreo orer orfe orff orfu oro- oroe orof oror orot orro orte orto oted otee oter oto- otoe otof otoo otor otre otro otte otto ottu otur oude oued ouer oufe ouff our- oure ouro ourt out- oute outo ouu- rder redd rede redo redr redu reed reef reet refd refe reff refr reft refu reod reof reot reou rerd rere rero rert reru retd rete reto retr rett reue reuf reut reuu rfef rodd rode rodo roed roer roet rofe roff rofo rood roof roor root rore roro rort roru rote roto rotr rott roud roue rouf rout rred rrrr rtdt rtee rudd rude rudo rued ruer ruet rufe ruff rufo ruft rurd rure ruro ruru rute ruto rutt rutu ruud tdff tdor tedd tede teed teef teer teet teff teft teor ter- tere terf tero terr teru tete teto tetr tett tetu teut tfot todd tode todo todt todu toed toee toer toet toff tofo toft tofu tood toof toor toot tord tore torf toro torr tort toru totd tote toto totr tott tour tout tre- tred tree tref treo tret treu trfd trfr trod troe troo trot trou trte trtr trud true trut truu tteo tter ttff ttoe tttt tude tudu tuer tuet tufe tuff tufo tuft tufu tuor turd ture turf turo turr turt turu tute tuto tutt tutu tuuo uder udet udoo udot ufer uffe uofo uor- uore urde urdu ure- ured uret urfe urff urft uro- uroo urre urte urur urut uter utfo utor utto uttu uutf uuuu