$rev1 = self::revOrTitle( $data['Revision1'], $data['Page1'] );
$rev2 = self::revOrTitle( $data['Revision2'], $data['Page2'] );
$rev1 = self::revOrTitle( $data['Revision1'], $data['Page1'] );
$rev2 = self::revOrTitle( $data['Revision2'], $data['Page2'] );