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import TestGame.Metadata
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import Mathlib
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Game "TestGame"
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World "Function"
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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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open Set
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def f2 : ℕ → ℕ := fun n ↦ if Even n then n^2 else n+1
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#eval (f2 + f2) 2
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#check range f2
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Statement
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""
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: True := by
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trivial
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#check Set.piecewise
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