#![allow(non_snake_case, unused_imports)]

use itertools::Itertools;
use proconio::{input, marker::Chars, marker::Usize1};
use std::cmp::{Reverse, max, min};
use std::collections::{BinaryHeap, HashMap, HashSet, VecDeque};

#[allow(unused_macros)]
macro_rules! d {
    ( $( $x:expr ),* $(,)? ) => {
        eprintln!(
            concat!( $( stringify!($x), "={:?} " ),* ),
            $( $x ),*
        );
    };
}

#[allow(dead_code)]
fn yn(b: bool) -> &'static str {
    if b { "Yes" } else { "No" }
}

fn f(xs: &[i64]) -> bool {
    let [a, b, c, d, e] = xs else {
        unreachable!();
    };

    a == c && b == d && d == e && a != b
}

fn main() {
    input! {
        T: usize,
    }

    for _ in 0..T {
        input! {
            N: usize,
            A: [i64; 5 * N],
        }

        let ans = A
            .chunks(5)
            .all(|a| f(a));

        println!("{}", yn(ans));
    }
}