<?phprequire '../FirstOrderLogicProp.inc.php';$p = new FirstOrderLogicProp('(a <!> b) & (b -> a)');$p->writeLn();$q = &$p->clone();$q->clean();$q->writeLn();$p->setValues(array('a'=>'1', 'b'=>'0'));$p->replaceWithValues();$p->writeLn();$p->clean();$p->writeLn();?>