fn mass_make_par_new(&self, data: &Data) -> Item {
    let mut pool = Pool::new(8);
    let (tx, rx) = std::sync::mpsc::channel();
    let mut counter = self.makers.len();
    pool.scoped(|scope| {
        for maker in self.makers.iter() {
            let tx = tx.clone();
            scope.execute(move || {
                let make_result = maker.make(data);
                tx.send(make_result).unwrap();
            });
        }
    });
    let mut result = Item::zero();
    while counter != 0 {
        result = Item::compose(&result, &rx.recv().unwrap());
        counter -= 1;
    }
    result
}