ffff ffii ffss fiff fifi fiii fiil fili fill fils fisi fiss fisu flii flis fluf flus fsfi fssf fuff fufu fuil fuli full fuls fulu fusi fuss fusu ifil ifis iiii iiis iisi iisu ilis ill- illi ills ilus isil isis isls issf issi isss issu isus iuiu iuss liff lifl liii liis lili lill lils lilu lisi liss lisu liuf lius llll luff lufu luif luis luli lull lulu lusi luss s-ii sfls sfss sfsu siff sifl sifu sil- silf sili sill sils silu sisi siss sisu siui sius sl-i slsu ssfl ssis sssf sssi ssss suf- suff sufi sufs sufu suis sul- sulf suli sull sulu sus- susi suss susu suus ulli ulul ulus usfi usfl usfs usif usis uslu ussf usss ussu usui usul usus uulu uusi uuuu