ffff ffii ffps ffss fiff fifi fifo fiii fiil fili fill filo fils fios fipp fips fisi fiss flii flip flis floo flop flos fofo foil fois foli foll folo fols foof fool foos fopp fops fosi foso foss fsfi fsfo fspf fssf fssp ifil ifis ifpo ifps ifso ifsp iiii iiio iiis iioi iioo iiop iios iipf iisi iisp ilio ilis ill- illi illo illp ills iloo ilos ioii ioio iolo ioof iooi iooo ioos iopl iops ioso ipil iplo ipop ipos ippf ippo ipsi ipso ipsp ipss isfp isil isis isls iso- isof isol isop isos ispf isps issf issi isso issp isss liff lifl lifo liii liis lili lill lilo lils lio- lios lip- lipi lipl lipo lipp lips lisi liso lisp liss llll lloo llps loff lofi loif lois loli loll lolo lols loof lool loop loos lopi lopp lops losi loso losp loss lpfp lppl lpss lsof lspl lsso lssp off- offo offs oiii oils oios olfs olio olis olli ollo olof olos olsi ooff oofs oolo oooo ooos oops oosi opii opio opis opls opo- opos oppi oppo opps opsi osii osip osis osli oslo osoi osoo osos ossi osso pfff pfis pfli pfps piff pifs piip pil- pili pill pilo pils pipi pipo pipp pips pisi piso piss plff plif plio plip plis ploo plop plos plpp plsi plss poff pofi poil poio pois poli poll polo pols poof pool poop poos pop- popi popo popp pops posi poso poss ppif ppli pplo ppos pppo pppp ppps ppsf ppss psfs psil psip psis psoi psol psos pspi pspp psps psso s-ii s-os sfio sfls sfos sfss siff sifl sifo sil- silf sili sill silo sils siol siop sios sipi sipo sipp sips sisi siss sl-i slip sllp sloo slop slos slpi slpp slps sofi sofo soif soil sois solf soli soll solo solp sols soof sool soop soos sopi sopo sopp sops sosi soso soss spfs spio spip spis splo splp spls spoo spop spos sppf spps spso spsp spss ssfl ssfp ssis sslp ssop sspf sspl sspo ssps sssf sssi ssss