rrrr rsts rstu rtss rtts rurs ruru russ rust rusu rusy ruts rutt rutu ruty ruvu ruys rysy rytt ryyt s-vt srtr srtv ssrs ssss ssts st-v strs stru stry stss sttr stur stus stut stuv stuy stvs styr stys sur- surr surs surt suru surv sury sus- suss sust susu susy sutu suty suus suvs suyr suyu svtr syrs syrt syry syss syst sytt sytv trst trtr trus trut truu trvs try- trys tssr tsst tsts tsys ttss tttt ttys turr turs turt turu tury tuss tust tuts tutt tutu tuty tuys tvrr tvss tvtv tyr- tyrr tyss tyst tytt tyty tyus urry urss ursu ursy urts urur urus urut ussr usss usst ussu ussy usts usus uttu uuuu uvvu uyts vryt vtrs vurt vutv vvvv vyrt vyss yssu yurt yury yust yutu yuty yuyu yyyy