ffff ffii ffss fftf fiff fifi fift fiii fisi fiss fist fisu fiti fits fitt fsfi fssf ftii fuff fufu fuit fusi fuss fust fusu futi futs futu ifis ifit iiii iiis iiit iisi iist iisu iitt isis isit issf issi isss issu isti ists isus itif itis itsf itsi itsu ittf iuiu iuss iust s-ii sfss sfsu sfts siff sift sifu siit sisi siss sist sisu sit- siti sits sitt situ siui sius siut ssis ssit sssf sssi ssss ssts stfu stif stis stit stsf stsi stss stuf stus stut suf- suff sufi sufs sufu suis suit sus- susi suss sust susu suti sutu suus tfsi tfss tiff tift tiit tiiu tisi tiss tist titi tits titt titu tsis tssf tssi tsst tsts tsui ttff ttss tttt tuff tufi tuft tufu tuis tuit tuiu tusi tuss tust tuti tuts tutt tutu uist uits usfi usfs usif usis ussf usss usst ussu usti usts usui usus utis utti uttu uusi uutf uuuu