ffff ffii ffrr fiff fifi fifo fiii fiil fili fill filo fior fipp flii flip floo flop flor fofo foil foli foll folo folr foof fool fopp for- fori forl foro forr fprf fril frio frip frol frop ifil ifor ifpo ifrf ifri iiii iiio iioi iioo iiop iipf ilio ilir ill- illi illo illp iloo ilpr ioii ioio iolo ioof iooi iooo iopl iori ipil iplo ipop ippf ippo ippr ipri iri- iril irio irip irop irri liff lifl lifo liii liir lili lill lilo lio- lior lip- lipi lipl lipo lipp liri lirl liro lirp lirr llll lloo loff lofi loif loir loli loll lolo loof lool loop loor lopi lopp lori loro lpfp lppl lprp lrif lroi lrrr off- offo offr ofor oiii olio olli ollo olof olor ooff oolo oooo opii opio opo- opor oppi oppo orff orfi ori- orif oril orio orlo oro- orof oror orpi orri orro pfff pffr pfli piff piip pil- pili pill pilo pipi pipo pipp piri pirl piro pirr plff plif plio plip ploo plop plpp plri poff pofi poil poio poli poll polo poof pool poop poor pop- popi popo popp pori poro porr ppif ppli pplo pppo pppp pprf pri- prif prii prlr pro- prof prol proo prop prri rffl riff riif rill rilo rilp riol ripi ripl ripp ripr riri rlif roff rofl rofo roif roil roio roir rolf roll rolo rolp roof rooi rool roop roor ropo rori roro rpii rpof rrif rrrr