ffff ffii ffrr fftf fiff fifi fifo fift fiii fiil fili fill filo fior fipp fiti fitt flii flip flit floo flop flor flot fofo foil foli foll folo folr folt foof fool foot fopp for- fori forl foro forr fort foti foto fotp fott fprf fril frio frip frit frol frop frot ft-l ftii ftop ifil ifit ifor ifpo ifrf ifri ifto iiii iiio iiit iioi iioo iiop iipf iitr iitt ilio ilir ilit ill- illi illo illp illt iloo ilot ilpr ioii ioio ioit iolo ioof iooi iooo iopl iori iotf ioto ipil iplo ipop ippf ippo ippr ipri ipto iri- iril irio irip irop irri irtf irti irtp itif itil itll itof itoi itol itoo itor itrf itri ittf itto lftp liff lifl lifo lift liii liir lili lill lilo lilt lio- lior lip- lipi lipl lipo lipp liri lirl liro lirp lirr lirt liti litl lito litr litt llll lloo loff lofi loft loif loir loit loli loll lolo loof lool loop loor loot lopi lopp lori loro loti lotl loto lotr lott lpfp lpft lppl lprp lrif lroi lrrr lttr off- offo offr ofit ofor oftp oiii oirt oiti olio olit olli ollo olof olor olot ooff oolo oooo oort ootp opii opio opit opo- opor oppi oppo opti opto orff orfi ori- orif oril orio orit orlo oro- orof oror orot orpi orri orro orto otfp otif otit oto- otof otoo otor otpp otro otti otto pfff pffr pfft pfit pfli piff piip pil- pili pill pilo pilt piot pipi pipo pipp piri pirl piro pirr pitf piti pito pitr pitt plff plif plio plip plit ploo plop plot plpp plri pltf pltt poff pofi poil poio poli poll polo polt poof pool poop poor poot pop- popi popo popp popt pori poro porr port potf poti poto pott ppif ppli pplo pppo pppp pprf pptt pri- prif prii prlr pro- prof prol proo prop prot prri prti prtp prtr ptol ptop ptrf rffl riff rift riif rill rilo rilp riol riot ripi ripl ripp ripr ript riri riti ritl rito ritt rlif roff rofl rofo roif roil roio roir roit rolf roll rolo rolp rolt roof rooi rool roop roor root ropo rori roro rort roti rotl roto rotr rott rpii rpof rrif rrrr rtlt rttp tfot tfpt tftp tiff tifo tift tiit till tilo tilr tilt tiop tip- tipi tipo tipp tipt tiri tirl tiro tirr titi tito titp titt tlli toff tofi tofo toft toil toit tol- toli toll tolo tolt toof tool toor toot top- topf topi topo topp topt torf tori toro torp torr tort toti toto totr tott tpir tpol tppp tppr tptp tptr trfr tri- trif tril trio trip trit troi troo trop trot trpp trtr ttff ttop tttt