private int setWordsHelper(List<L> words, int wordNum) {
if (isLeaf()) {
label = words.get(wordNum);
return wordNum + 1;
} else {
for (Tree<L> child : getChildren()) wordNum = child.setWordsHelper(words, wordNum);
return wordNum;
}
}
/* Set the words at the leaves of a tree to the words from the
* list */
public void setWords(List<L> words) {
setWordsHelper(words, 0);
}