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5 letter words:

fasts8, tufas8,

4 letter words:

fast7, fats7, fuss7, tufa7, tass4, taus4, utas4,

3 letter words:

aft6, fas6, fat6, aas3, ass3, sat3, sau3, tas3, tau3, uta3, uts3,

2 letter words:

fa5, aa2, as2, at2, ta2, us2, ut2,