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6. Write a new static method of the BTNode class to meet the following specification. public static int count7 (BTNode root) // Precondition: root is

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6. Write a new static method of the BTNode class to meet the following specification. public static int count7 (BTNode root) // Precondition: root is the root reference of a binary tree. /1 Postcondition: The return value indicates how many times 7 appears 1/ in the tree. NOTE: If the tree is empty, the method returns zero

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