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import TestGame.Metadata
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import Mathlib
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Game "TestGame"
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World "SetFunction"
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Level 4
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Title ""
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Introduction
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"
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"
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Statement
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""
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(I U V : Type _) (f : U → V) (N : I → Set V) :
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f ⁻¹' (⋃ (i : I), N i) = ⋃ i, f ⁻¹' (N i) := by
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simp
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