ffff ffrr ffss ffun fluf flur flus fnrs fnuf frns frun fsln fssf fuff fufu full fuls fulu funf funs fur- furl furn furr furs fuss fusu llll lnfs lrrr ls-r lssr luff lufu lull lulu lunn luns lurs luss nfff nfrs nfsr nfsu nlls nnls nnnn nnsl nnss nrrl nsfs nslr nsls nsnr nsrl nssf nssr nsss nuff null nunn nuns nurl nurn nurr nurs nuru nusl nuss nusu rffl rlls rrrr rrun rsnn rsnr rssl ruff rull runf runn runs rurs ruru russ rusu ruun sfls sfss sfsu slln slrn slrs slsu slur snfu snlf snns snrs snur snus srnn ssfl ssns ssrl ssrs sssf ssss suf- suff sufr sufs sufu sul- sulf sull sulu sun- sunn suns sunu sur- surf surn surr surs suru sus- suss susu suus ullr ulul ulus unlf unns unrf unrs uns- unus urff urls urns urss ursu urun urur urus usfl usfs uslu usnr usnu ussf ussr usss ussu usul usun usus uulu uuuu