dddd ddot ddpo dfdt dfrf dftr dod- dodd dodo doff dood doof doop door doot dopo dopp dopr dopt dord dorf doro dorp dorr dort doru dotd doto dott doud douf doup dour dout dpdt drod drof drop drot drou drup drut druu dtdp dtor dtot dttp dudd dudo dudu duff dufu duo- dupo duro durt duru dutp duur duut fdot ffff ffrr fftf fofo food foof foot fopp for- ford foro forr fort foto fotp fott foud foup four fout fpdt fprf frop frot frou frpd ftop fudd fuff fufu fuor fur- furo furr furt futo futu oddd odoo odop odor odot odou odrp odtu odur ofdr off- offo offr offu ofor oftp ooff oooo oord oort ootp opo- opor oppo opto ordo ordu orff orfu oro- orof oror orot orro orto orup otfp oto- otof otoo otor otpp otro otto ottu otur ouff our- ouro ourt out- outo ouu- pdpr pfff pffr pfft pod- podd podo podu poff pood poof poop poor poot pop- popo popp popt poro porr port potd potf poto pott potu poud pouf poup pour pout ppod pppd pppo pppp pprf ppru pptt ppur pro- prod prof proo prop prot prou prpd prrd prtp prtr prud pruf prut pruu ptop ptpd ptrd ptrf pudo pudu puff puft pupu pur- puro purp purr puru put- puto putt putu rodd rodo roff rofo rood roof roop roor root ropo roro rort roru roto rotr rott roud rouf roup rout rpdp rpof rptd rrrr rtdt rttp rudd rudo rudp ruff rufo ruft rupp rupt rurd ruro rurp ruru ruto rutt rutu ruud tdff tdor tfot tfpt tftp todd todo todt todu toff tofo toft tofu tood toof toor toot top- topd topf topo topp topt topu tord torf toro torp torr tort toru totd toto totr tott toup tour tout tpdf tpdu tppd tppp tppr tptp tptr tput trfd trfr trod troo trop trot trou trpp trtr trud trut truu ttff ttop tttt tudu tuff tufo tuft tufu tuor tupo tupu turd turf turo turp turr turt turu tuto tutt tutu tuuo u-rp udoo udop udot udpd uftp uofo uor- updf updo upor uppp uppu upto upup urdu urff urft uro- uroo urpo urup urur urut utfo utor utpd utto uttu uutf uuuu