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Simplify by writing in exponential form.
1. (a) (a) (a) (a) =
2. (7) (7) (7) =
3. (-3) (-3) (-3) (-3) (-3) (-3) =
4. (5y) (5y) (5y) (5y) (5y) =
5. (xy) (xy) (xy) (xy) =​