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Jun 20th, 2018
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  1. Lemma exercise1 : forall A B C:Prop, A/\(B/\C)->(A/\B).
  2. Proof.
  3. intros A B C H.
  4. destruct H as [H1 [H2 H3]].
  5. split.
  6. exact H1.
  7. exact H2.
  8. Qed.
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