public String pluralize(String word) {
        if (uncountables.contains(word.toLowerCase())) {
            return word;
        }
        return replaceWithFirstRule(word, plurals);
    }
@Test
    public void testPluralize() {
        assertThat(Inflector.getInstance().pluralize("mattress"), is("mattresses"));
        assertThat(Inflector.getInstance().pluralize("address"), is("addresses"));

    }