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name = 'tolistBT/2'
slug = 'construct a list with all elements of a binary tree'
description = '''\
<p><code>tolistBT(T, L)</code>: the list <code>L</code> contains all the elements in the binary tree <code>T</code>, in infix order.</p>
<pre>
?- tolistBT(b(b(nil,2,nil),1,b(nil,3,nil)), L).
L = [2,1,3].
</pre>'''
hint = {}
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