dddd dfrf dod- dodd dodo doff dold dolf doll dolo dolu dond donn dono donr dood doof dool doon door dord dorf dorn doro dorr doru doud douf doul doun dour drno drod drof drol dron drou druu dudd dudo dudu duff dufu dull dulo dulu dunn duno duo- duon durn duro duru duul duur fdlr ffff ffrr ffun fldr flod flon floo flor flou flud fluf fluo flur fndd fndn fndr fnuf fofo fold foll folo folr fond fono food foof fool foon for- ford forl forn foro forr foud foul foun four frol fron frou frun fudd fuff fufu full fulu fund funf fuor fur- furl furn furo furr lfrd llll llod lloo llud lndn loff lofn lold loll lolo lond lono lonr lood loof lool loon loor lord lorn loro loud loul loun lour louu lrdd lron lrrr ludd ludo luff lufu lull lulu lund lunn luno lurd nddo ndor ndrf nfff nfld nfon nnnn nodo nodu nold nolf noll nolo non- nonn nono nonu noo- nool noon nooo noor nor- nord norf norn noro norr noul noun nour nron nrrd nrrl nudd nudo nuff null nunn nuno nuon nurd nurl nurn nurr nuru oddd odon odoo odor odou odrl odur ofdr off- offo offr offu ofno ofor oldn ollo olof olon olor olur ondo onlf onno onod onon onor onur ooff oold oolo oooo oord ordn ordo ordu orff orfu orlo orlu orno oro- orof oron oror orro ouff ould oulu oun- ound our- ourn ouro ouu- rffl rndf rnld rnod rodd rodo roff rofl rofo rold rolf roll rolo rond rono rood roof rool roon roor roro roru roud rouf roul roun rrrr rrun rudd rudl rudo ruff rufo rull rulo rund runf runn runo rurd ruro ruru ruud ruun udon udoo udun ullo ullr ulno ulo- ulul undo unfd unlf unno unon unrf unro uofl uofo uor- urdu urff uro- urol uroo urun urur uulu uuno uuuu