fn main() {
    let mut t = String::new();
    std::io::stdin().read_line(&mut t).ok();
    let t: usize = t.trim().parse().unwrap();
    let queries = (0..t).map(|_| {
            let mut temp = String::new();
            std::io::stdin().read_line(&mut temp).ok();
            let temp: Vec<usize> = temp.trim().split_whitespace().map(|s| s.parse().unwrap()).collect();
            (temp[0], temp[1])
        })
        .collect::<Vec<_>>();

    for &(a, b) in queries.iter() {
        if b - a <= 120 {
            println!("{}", b-a);
            println!("{}", vec!["1"; b-a].join(" "));
            continue;
        }
        let mut target = a;
        let mut op = vec![];
        while target < b {
            if target * 2 <= b {
                op.push(target);
                target *= 2;
                continue;
            }
            if target % 2 == 1 {
                op.push(1);
                target += 1;
                continue;
            }
            for i in 2.. {
                if target % i > 0 { continue; }
                if target + target / i > b { continue; }
                op.push(target / i);
                target += target / i;
            }
        }
        println!("{}", op.len());
        println!("{}", op.iter().map(|v| v.to_string()).collect::<Vec<_>>().join(" "));
    }
}