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import TestGame.Metadata
import Std.Tactic.RCases
import Mathlib.Tactic.Contrapose
Game "TestGame"
World "Contradiction"
Level 8
Title "Kontraposition"
Introduction
"
Im Gegensatz zum Widerspruch, wo
"
-- TODO: `even`/`odd` sind in Algebra.Parity. Not ported yet
-- Statement
-- "Ist n² ungerade, so ist auch n ungerade. Beweise durch Widerspruch."