X322: Binary Tree Check Value Exercise (Modified)

Write a recursive function that returns true if there is a node in the given binary tree with the given value, and false otherwise. Note that this tree is not a Binary Search Tree.
Here are methods that you can use on the BinNode objects:
   interface BinNode {
      public int value();
      public void setValue(int v);
      public BinNode left();
      public BinNode right();
      public boolean isLeaf();
   }

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