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@ -835,9 +835,7 @@ Lemma tm_step_single_bit_index : forall (n : nat),
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nth_error (tm_step (S n)) (2^n) = Some true.
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Proof.
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intros n.
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induction n.
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- simpl. reflexivity.
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- rewrite tm_build.
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rewrite tm_build.
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rewrite nth_error_app2. rewrite tm_size_power2. rewrite Nat.sub_diag.
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replace (true) with (negb false). apply map_nth_error.
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rewrite tm_step_head_1. simpl. reflexivity.
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