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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 8
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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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: (fun (n : ℤ) ↦ n + 1).Bijective := by
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constructor
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intro a b hab
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simp at hab
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assumption
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intro y
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use y-1
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simp
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