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private BinaryNode<E> insert(E e, BinaryNode<E> t) {
if (t == null)
return new BinaryNode<E>(e, null, null);
int compareResult = e.compareTo(t.element);
if (compareResult < 0) {
t.left = insert(e, t.left);
} else if (compareResult > 0) {
t.right = insert(e, t.right);
} else
;
return t;
}