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Answer :

Abu99go

Principles:

a⁻¹ = ¹/ₐ

a⁰ = 1

a¹ = a

y = 4⁻¹

y = ¹/₄

y = 4⁰

y = 1

y = 4¹

y = 4

y = 4²

y = 16

y = 4³

y = 64

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