dddd ddot ddpo dfdt dfrf dfri dftr didi dido dif- diff diii diop dior diot dipo dipp dipt dird dirr dirt diti dito ditt dod- dodd dodi dodo doff doid doit dood doof doop door doot dopo dopp dopr dopt dord dorf dori doro dorp dorr dort dotd doti doto dott dpdt drif drip drit drod drof drop drot dtdp dtor dtot dttp fdot fdti ffff ffii ffrr fftf fidf fido fiff fifi fifo fift fiii fior fipp fiti fitt fofo foid food foof foot fopp for- ford fori foro forr fort foti foto fotp fott fpdt fprf frid frio frip frit frop frot frpd ftdi ftii ftop iddo idfp idid idio idir idrf idro idtp ifid ifit ifor ifpo ifrf ifri ifto iiii iiio iiit iioi iioo iiop iipf iitr iitt iod- iodd iodo ioii ioio ioit ioof iooi iooo iori iotf ioto ipdi ipid ipod ipop ippf ippo ippr ipri ipto irdo irdp iri- irid irio irip irod irop irri irtf irti irtp itdo itif itof itoi itoo itor itrf itri ittf itto oddd oddi odio odir odoo odop odor odot odrp ofdr off- offo offr ofid ofit ofor oftp oido oiii oirt oiti oodi ooff ooid oooo oord oort ootp opii opio opit opo- opor oppi oppo opti opto ordo orff orfi ori- orid orif orio orit oro- orof oror orot orpi orri orro orto otfp otif otit oto- otof otoo otor otpp otro otti otto pdpr pfff pffr pfft pfit pido piff piip piot pipi pipo pipp piri piro pirr pitf piti pito pitr pitt pod- podd podi podo poff pofi poid poio pood poof poop poor poot pop- popi popo popp popt pori poro porr port potd potf poti poto pott ppid ppif ppod pppd pppo pppp pprf pptt pri- prid prif prii pro- prod prof proo prop prot prpd prrd prri prti prtp prtr ptop ptpd ptrd ptrf rdio rfdi rfid ridd ridi rido riff rift riif riot ripd ripi ripp ripr ript riri riti rito ritt rodd rodi rodo roff rofo roid roif roio roir roit rood roof rooi roop roor root ropo rori roro rort roti roto rotr rott rpdp rpii rpof rptd rrif rrrr rtdt rttp tdff tdor tdri tfot tfpt tftp tidd tiff tifo tift tiit tiop tip- tipi tipo tipp tipt tird tiri tiro tirr titi tito titp titt todd todi todo todt toff tofi tofo toft toid toit tood toof toor toot top- topd topf topi topo topp topt tord torf tori toro torp torr tort totd toti toto totr tott tpdf tpir tppd tppp tppr tptp tptr trfd trfr tri- trif trio trip trit trod troi troo trop trot trpp trtr ttff ttop tttt