private Tree<String> buildTagTree(List<String> words, List<String> tags, int currentPosition) {
Tree<String> leafTree = new Tree<String>(words.get(currentPosition));
Tree<String> tagTree =
new Tree<String>(tags.get(currentPosition), Collections.singletonList(leafTree));
return tagTree;
}
private Tree<String> addRoot(Tree<String> tree) {
return new Tree<String>("ROOT", Collections.singletonList(tree));
}
