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 bstr = format!("{:b}", b).chars().collect::<Vec<_>>();
        let astr = format!("{:b}", a);
        let astr = format!("{}{}", "0".repeat(bstr.len()-astr.len()), astr).chars().collect::<Vec<_>>();
        let n = bstr.len();
        let start = (0..n).filter(|&i| bstr[i] != astr[i]).nth(0).unwrap();
        let mut result = vec![];
        let mut aval = a;
        for i in (start+1..n).rev() {
            let idx = n - 1 - i;
            if (aval >> idx) & 1 == 1 {
                result.push(1usize << idx);
                aval += 1usize << idx;
            }
        }
        for i in 0..n {
            let idx = n - 1 - i;
            if ((aval >> idx) & 1) != ((b >> idx) & 1) {
                result.push(1usize << idx);
                aval += 1usize << idx;
            }
        }
        println!("{}", result.len());
        println!("{}", result.iter().map(|v| v.to_string()).collect::<Vec<_>>().join(" "));
    }
}