dddd ddpo dfrf dfri didi dido didu dif- diff diii diop dior diou dipo dipp dipu dird dirr dod- dodd dodi dodo doff doid dood doof doop door dopo dopp dopr dord dorf dori doro dorp dorr doru doud douf doup dour drif drip drod drof drop drou drui drup druu dudd dudo dudu duff dufu duid duif duir duo- dupo duri duro duru duur ffff ffii ffrr fidf fido fiff fifi fifo fiii fior fipp fofo foid food foof fopp for- ford fori foro forr foud foup four fprf frid frio frip frop frou frpd fudd fudi fuff fufu fuid fuir fuor fur- furi furo furr iddo idfp idid idio idir idrf idro iduo ifid ifor ifpo ifrf ifri iiii iiio iioi iioo iiop iipf iod- iodd iodo ioii ioio ioof iooi iooo iori ipdi ipid ipod ipop ippf ippo ippr ipri ipur irdo irdp irfu iri- irid irio irip irod irop irri iuiu iupp oddd oddi odio odir odiu odoo odop odor odou odrp odur ofdr off- offo offr offu ofid ofor oido oiii oodi ooff ooid oooo oord opii opio opo- opor oppi oppo ordo ordu orff orfi orfu ori- orid orif orio oro- orof oror orpi orri orro orup ouff ouii ouir our- ouro ouu- pdpr pfff pffr pfui pido piff piip pipi pipo pipp piri piro pirr piru pod- podd podi podo podu poff pofi poid poio pood poof poop poor pop- popi popo popp pori poro porr poud pouf poui poup pour ppid ppif ppod pppd pppo pppp pprf ppru ppur pri- prid prif prii pro- prod prof proo prop prou prpd prrd prri prud pruf pruu pudo pudu puff puid puir puiu pupi pupu pur- puri puro purp purr puru rdio rfdi rfid ridd ridi rido riff rifu riif riou ripd ripi ripp ripr riri rodd rodi rodo roff rofo roid roif roio roir roiu rood roof rooi roop roor ropo rori roro roru roud rouf roup rpdp rpii rpof rrif rrrr rudd rudi rudo rudp ruff rufo ruid ruif rupp rurd ruri ruro rurp ruru ruud u-rp uddi udid udir udoo udop udpd ufip uipi uirr uofo uor- updf updo upor uppp uppu upri upup urdu urff urfi urif uriu uro- uroo urpo urri urup urur uuri uuuu