ffff ffii ffss fiff fifi fifo fiii fiil fili fill filo fils fios fisi fiss flii flis floo flos fofo foil fois foli foll folo fols foof fool foos fosi foso foss fsfi fsfo fssf ifil ifis ifso iiii iiio iiis iioi iioo iios iisi ilio ilis ill- illi illo ills iloo ilos ioii ioio iolo ioof iooi iooo ioos ioso isil isis isls iso- isof isol isos issf issi isso isss liff lifl lifo liii liis lili lill lilo lils lio- lios lisi liso liss llll lloo loff lofi loif lois loli loll lolo lols loof lool loos losi loso loss lsof lsso off- offo offs oiii oils oios olfs olio olis olli ollo olof olos olsi ooff oofs oolo oooo ooos oosi osii osis osli oslo osoi osoo osos ossi osso s-ii s-os sfio sfls sfos sfss siff sifl sifo sil- silf sili sill silo sils siol sios sisi siss sl-i sloo slos sofi sofo soif soil sois solf soli soll solo sols soof sool soos sosi soso soss ssfl ssis sssf sssi ssss