// ---------- begin scannner ----------
#[allow(dead_code)]
mod scanner {
    use std::str::FromStr;
    pub struct Scanner<'a> {
        it: std::str::SplitWhitespace<'a>,
    }
    impl<'a> Scanner<'a> {
        pub fn new(s: &'a String) -> Scanner<'a> {
            Scanner {
                it: s.split_whitespace(),
            }
        }
        pub fn next<T: FromStr>(&mut self) -> T {
            self.it.next().unwrap().parse::<T>().ok().unwrap()
        }
        pub fn next_bytes(&mut self) -> Vec<u8> {
            self.it.next().unwrap().bytes().collect()
        }
        pub fn next_chars(&mut self) -> Vec<char> {
            self.it.next().unwrap().chars().collect()
        }
        pub fn next_vec<T: FromStr>(&mut self, len: usize) -> Vec<T> {
            (0..len).map(|_| self.next()).collect()
        }
    }
}
// ---------- end scannner ----------

use std::io::Write;
use std::collections::*;

fn main() {
    use std::io::Read;
    let mut s = String::new();
    std::io::stdin().read_to_string(&mut s).unwrap();
    let mut sc = scanner::Scanner::new(&s);
    let out = std::io::stdout();
    let mut out = std::io::BufWriter::new(out.lock());
    run(&mut sc, &mut out);
}

fn run<W: Write>(sc: &mut scanner::Scanner, out: &mut std::io::BufWriter<W>) {
    let t: u32 = sc.next();
    for _ in 0..t {
        let n: usize = sc.next();
        let m: usize = sc.next();
        let a = sc.next_vec::<u32>(n);
        let ans = solve(a, m);
        writeln!(out, "{}", ans).ok();
    }
}

fn solve(a: Vec<u32>, m: usize) -> u32 {
    if a.len() <= 2 * m {
        return naive(a, m);
    }
    let geta = a.len() - 2 * m;
    let mut f = Vec::from(&a[..m]);
    let mut g = Vec::from(&a[(a.len() - m)..]);
    for _ in 0..geta {
        f.push(0);
        f = f.windows(2).map(|f| (f[0] + f[1]).pow(2)).collect();
        g.insert(0, 0);
        g = g.windows(2).map(|f| (f[0] + f[1]).pow(2)).collect();
    }
    f.extend(g.iter().cloned());
    naive(f, m)
}

fn naive(mut a: Vec<u32>, m: usize) -> u32 {
        for _ in 1..a.len() {
            a = a.windows(2).map(|a| (a[0] + a[1]).pow(2)).collect();
        }
        a[0] % (1 << m)
}