ffff ffii ffrr fftf fiff fifi fifo fift fiii fini finn fino fint fion fior firn fiti fitt fofo foin fono font foof foon foot for- fori forn foro forr fort foti foto fott frin frio frit fron frot ftii i-no ifit ifni ifno ifnr ifor ifrf ifri iftn ifto iiii iiio iiit iino iioi iioo iitr iitt infi info init inni inno innr ino- inoi inon inor inot inri inro inti intn into intr ioii ioio ioit ioni ionn iono ioof iooi iooo iori iotf ioto iri- irin irio iron irri irtf irti itif itin itno itof itoi iton itoo itor itrf itri ittf itto n-ii nfff nfon nfto niff nift niir niit nini nino nion nioo niro nirt nitf niti nito nitr nnit nnnn nnot nntn nofi noif noin noio noir noit non- noni nonn nono nont noo- noon nooo noor noot nor- norf nori norn noro norr nort not- noti noto nott nron ntof ntto nttr off- offo offr ofit ofno ofor oiii oint oion oirt oiti onir onit onni onno onon onor ont- onti onto ooff oont oooo oort orff orfi ori- orif orin orio orit orni orno oro- orof oron oror orot orri orro orto otif otin otit oto- otof oton otoo otor otro otti otto riff rift riif riin rinf rinn rino rion riot riri riti rito ritt rnin rnnt rnot roff rofo roif roin roio roir roit roni rono ront roof rooi roon roor root rori roro rort roti rotn roto rotr rott rrif rrrr tfin tfot tiff tifo tift tiit tini tinn tino tint tion tiri tiro tirr titi tito titt toff tofi tofo toft toit toni tonn tono toof toon toor toot torf tori torn toro torr tort toti toto totr tott trfr tri- trif trin trio trit trno troi tron troo trot trtr ttff ttfn tton tttt