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An element A is called the child of element B if and only if B is the parent of A.
A child is also a direct descendant of its parent and may have zero or more sibling (ie sister/brother)
If the child has no child, it's a leaf on the tree.
An element A is called the child of element B if and only if B is the parent of A.
A child is also a direct descendant of its parent and may have zero or more sibling (ie sister/brother)
If the child has no child, it's a leaf on the tree.
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