iiii iiis iiit iirs iisi iisr iist iisu iitr iitt iri- iris irri irrs irti irts irus isis isit isri issi issr isss issu isti istr ists isus itis itri itrs itsi itsu itur iuiu iuss iust riis riri rirs risi riss rist risu riti rits ritt ritu rius rrrr rsis rsts rstu rtss rtts ruis ruit ruri rurs ruru rusi russ rust rusu ruti ruts rutt rutu s-ii siit siri sirr sirs sirt siru sisi siss sist sisu sit- siti sits sitt situ siui sius siut sris srtr ssis ssit ssri ssrs sssi ssss ssts stir stis stit stri strs stru stsi stss sttr stur stus stut suir suis suit sur- suri surr surs surt suru sus- susi suss sust susu suti sutu suus tiit tiiu tiri tirr tirs tiru tisi tiss tist titi tits titt titu tri- tris trit trsi trst trtr trus trut truu tsis tssi tssr tsst tsts tsui ttss tttt tuis tuit tuiu turi turr turs turt turu tusi tuss tust tuti tuts tutt tutu uirr uist uits uris uriu urri ursi urss ursu urts urur urus urut usis ussr usss usst ussu usti usts usui usus utis utri utti uttu uuri uusi uuuu