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M is
the root of this tree
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G is
the root of the left
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subtree
of M
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B,
H, J, N, and S are leaves
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N is
the left child of P; S is
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the right
child
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P is
the parent of N
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M
and G are ancestors of D
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P,
N, and S are descendents
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of W
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A
collection of several trees
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is
called a forest
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