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() {
        let mut target = a;
        let mut op = vec![];
        for i in 0..60 {
            if target & ((1usize << (i+1)) - 1) > 0 && target + (1usize << i) <= b {
                target += 1usize << i;
                op.push(1usize << i);
            }
        }
        for i in (0..60).rev() {
            if b & (1usize << i) > 0 && target & (1usize << i) == 0 {
                target += 1usize << i;
                op.push(1usize << i);
            }
        }
        println!("{}", op.len());
        println!("{}", op.iter().map(|v| v.to_string()).collect::<Vec<_>>().join(" "));
    }
}