public static function findMatch($m)
{
$terms = explode('_', $m);
array_pop($terms);
$prefix = implode('_', $terms);
self::addOften($prefix);
$ret = array();
foreach (self::$_often as $name) {
if ('' === trim($m) or strpos($name, $m) === 0) {
$ret[] = $name;
}
}
return $ret;
}