use std::io::*;
use std::str::FromStr;

fn calc(x: i64, mx: i64) -> i64 {
    if x % 2 == 1 {
        return 1;
    }
    let mut ret: i64 = 0;
    let mut i: i64 = 1;
    while i <= x {
        if x % i == 0 {
            if i <= mx && i > ret {
                ret = i
            }
            if x / i <= mx && x / i > ret {
                ret = x / i
            }
        }
        i *= 2;
    }
    ret
}

fn solve(a: i64, b: i64) {
    let mut ret: Vec<i64> = Vec::new();

    let mut x = a;
    while x != b {
        if x + x <= b {
            ret.push(x);
            x += x;
        } else {
            let y = calc(x, b - x);
            ret.push(y);
            x += y;
        }
    }

    println!("{}", ret.len());
    for i in 0..ret.len() {
        if i > 0 {
            print!(" ");
        }
        print!("{}", ret[i]);
    }
    println!();
}

fn main() {
    let mut s = String::new();
    stdin().read_line(&mut s).ok();
    let mut itr = s.split_whitespace().map(|x| i32::from_str(x).unwrap());
    let t = itr.next().unwrap();

    for _i in 0..t {
        s.clear();
        stdin().read_line(&mut s).ok();
        let mut itr = s.split_whitespace().map(|x| i64::from_str(x).unwrap());
        let (a, b) = (itr.next().unwrap(), itr.next().unwrap());

        solve(a, b);
    }
}