import fi.uef.cs.tra.BTree;
import fi.uef.cs.tra.BTreeNode;

import java.util.HashSet;
import java.util.Set;

public class TRAII_25_X1_skeleton implements TRAII_25_X1 {
    /**
     * SELF-EVALUATION HERE:
     *
     *
     *
     */
    /**
     * Nodes with two children.
     * Returns a set all the nodes of binary tree T that have at two children.
     * @param T input binary tree
     * @param <E> element type
     * @return set of nodes with two children
     */
    @Override
    public <E> Set<BTreeNode<E>> twoChildNodes(BTree<E> T) {
        Set<BTreeNode<E>> result = new HashSet<>();

        // TODO

        return result;
    }

}