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u

-u sfx., enc.prt. if, whether. Interrogative particle. 

This particle, generally added to the first or second word of a clause, gives it an interrogative meaning. It may also indicate a subjunctive or “if” sense, as in:
Frah ina gauƕasēƕi.” (Ask him has-u-what-saw, i.e. Ask him if he's seen anything.)