nnnn nnss nntn nrts nsnr nssr nsss nsts nstu ntnu ntru ntss ntsu nttr nunn nuns nunt nurn nurr nurs nurt nuru nuss nust nusu nuts nutt nutu rnnt rnut rrrr rrun rsnn rsnr rsts rstu rtns rtss rtts runn runs runt rurs ruru russ rust rusu ruts rutt rutu ruun snns snrs sntr snur snus srnn srtr ssns ssrs ssss ssts stnn stnr stns strn strs stru stss sttr stun stur stus stut sun- sunn suns sunt sunu sur- surn surr surs surt suru sus- suss sust susu sutu suus tnts tnut trst trtr trun trus trut truu tssr tsst tsts tsun ttss tttt tunn tuns tunu turn turr turs turt turu tuss tust tuts tutt tutu unns unrs uns- unst unts unus unut urns urss ursu urts urun urur urus urut usnr usnu ussr usss usst ussu usts usun usus uttu uuuu