/**
     * Counts how many strings in wordArray are not found in theVocab, as described
     * in
     * part (a).
     */
    public int countNotInVocab(String[] wordArray)
    {
        int count = 0;
        for(String w: wordArray) {
            if(!findWord(w)) {
                count++;
            }
        }
        return count;
    }

    /**
     * Returns an array containing strings from wordArray not found in theVocab,
     * as described in part (b).
     */
    public String[] notInVocab(String[] wordArray)
    {
        int c = countNotInVocab(wordArray);
        String result[] = new String[c];
        int count = 0;
        for(String w: wordArray) {
            if(!findWord(w)) {
                result[count++] = w;
            }
        }
        return result;
    }

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