Function tree node contains value

tree search node

Format:

tree node contains value

Input:

Output:

Conditional properties that reference this function:

• if val < a, then tree (node (a, left, right)) contains val = tree left contains val (link)
• if val > a, then tree (node (a, left, right)) contains val = tree right contains val (link)
• if val = a, then tree (node (a, left, right)) contains val = True (link)

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