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 astr = format!("{:b}", a).chars().collect::<Vec<_>>();
        let bstr = format!("{:b}", b).chars().collect::<Vec<_>>();

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