dddd ddpo dfrf dfri didi dido dif- diff diii diop dior dipo dipp dird dirr dod- dodd dodi dodo doff doid dood doof doop door dopo dopp dopr dord dorf dori doro dorp dorr drif drip drod drof drop ffff ffii ffrr fidf fido fiff fifi fifo fiii fior fipp fofo foid food foof fopp for- ford fori foro forr fprf frid frio frip frop frpd iddo idfp idid idio idir idrf idro 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 irdo irdp iri- irid irio irip irod irop irri oddd oddi odio odir odoo odop odor odrp ofdr off- offo offr ofid ofor oido oiii oodi ooff ooid oooo oord opii opio opo- opor oppi oppo ordo orff orfi ori- orid orif orio oro- orof oror orpi orri orro pdpr pfff pffr pido piff piip pipi pipo pipp piri piro pirr pod- podd podi podo poff pofi poid poio pood poof poop poor pop- popi popo popp pori poro porr ppid ppif ppod pppd pppo pppp pprf pri- prid prif prii pro- prod prof proo prop prpd prrd prri rdio rfdi rfid ridd ridi rido riff riif ripd ripi ripp ripr riri rodd rodi rodo roff rofo roid roif roio roir rood roof rooi roop roor ropo rori roro rpdp rpii rpof rrif rrrr