# first proof
ADD { Lemma a : True. }
ADD { Proof using. }
ADD here { trivial. } # first error
ADD { fail. }
ADD { Qed. }
WAIT
EDIT_AT here
# Fixing the proof
ADD { Qed. }
WAIT
EDIT_AT here
ADD { Qed. }
JOIN
[ Dauer der Verarbeitung: 0.4 Sekunden
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