// baseNode - the node holding the group to take the set from
 // excludeNode - the node to use as a set of black list operators to remove
 public NotTreeNode(BinaryTree <T> baseNode, BinaryTree <T> excludeNode)
 {
 }
 public AndTreeNode(BinaryTree <T> left, BinaryTree <T> right)
 {
     m_left  = left;
     m_right = right;
 }