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For
"nodes" that contain two data items
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there
can be either no children or 3 children:
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In
this case, the value of the smaller key at the
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"node"
must be greater than the value of each
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key
in the left subtree and smaller than the
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value
of each key in the middle subtree.
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The
value of the larger key at the "node" must
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be
greater than the value of each key in the
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middle
subtree and smaller than the value of
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each
key in the right subtree.
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