public function testStep4()
{
$this->assertEquals('reviv', Stemmer::step4('revival'));
$this->assertEquals('allow', Stemmer::step4('allowance'));
$this->assertEquals('infer', Stemmer::step4('inference'));
$this->assertEquals('airlin', Stemmer::step4('airliner'));
$this->assertEquals('gyroscop', Stemmer::step4('gyroscopic'));
$this->assertEquals('adjust', Stemmer::step4('adjustable'));
$this->assertEquals('defens', Stemmer::step4('defensible'));
$this->assertEquals('irrit', Stemmer::step4('irritant'));
$this->assertEquals('replac', Stemmer::step4('replacement'));
$this->assertEquals('adjust', Stemmer::step4('adjustment'));
$this->assertEquals('depend', Stemmer::step4('dependent'));
$this->assertEquals('adopt', Stemmer::step4('adoption'));
$this->assertEquals('homolog', Stemmer::step4('homologou'));
$this->assertEquals('commun', Stemmer::step4('communism'));
$this->assertEquals('activ', Stemmer::step4('activate'));
$this->assertEquals('angular', Stemmer::step4('angulariti'));
$this->assertEquals('homolog', Stemmer::step4('homologous'));
$this->assertEquals('effect', Stemmer::step4('effective'));
$this->assertEquals('bowdler', Stemmer::step4('bowdlerize'));
}
