proofs-toggle.sed

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s|<span class="id" type="keyword">Proof</span>.\(<br/>\)*|<a class="proof" href="#">Show proof.</a><br/><div class="proof">|g
s|<span class="id" type="keyword">Next</span> <span class="id" type="keyword">Obligation</span>.\(<br/>\)*|<a class="proof" href="#">Show proof.</a><br/><div class="proof">|g
t goto-end-proof
b
:goto-end-proof
s|\(&nbsp;\)*<span class="id" type="keyword">Qed</span>.\(<br/>\)*|</div>|g
s|\(&nbsp;\)*<span class="id" type="keyword">Defined</span>.\(<br/>\)*|</div>|g
t
n
b goto-end-proof