Assertion: tree's node | /r/HasAspect | left child
Facets:
Source sentences:
text: A more informal way of making the distinction is to say, quoting the Encyclopedia of Mathematics, that "every node has a left child, a right child, neither, or both" and to specify that these "are all different" binary trees.
text: which would be implemented in memory as the binary tree on the right, without any letters on those nodes that have a left child.