Avoid exponential blowup in [done] as caused by a7e91677.
Example: Goal ¬False → ¬False → ¬False → ¬False → ¬False → ¬False → ¬False → False. Proof. intros. done. (* takes very long *)
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Example: Goal ¬False → ¬False → ¬False → ¬False → ¬False → ¬False → ¬False → False. Proof. intros. done. (* takes very long *)