fn main() {
    let mut t = String::new();
    std::io::stdin().read_line(&mut t).ok();
    let t: usize = t.trim().parse().unwrap();

    for _ in 0..t {
        let mut ab = String::new();
        std::io::stdin().read_line(&mut ab).ok();
        let ab: Vec<usize> = ab.trim().split_whitespace().map(|s| s.parse().unwrap()).collect();
        let a = ab[0];
        let b = ab[1];
        let mut stack = vec![];

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