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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