Code shared from the Rust Playground

playground.rs

use itertools::Itertools;
use rand::prelude::SliceRandom; // 0.8.5 // 0.10.3
fn main() {
    let mut rng = rand::thread_rng();

    let items = (0..9)
        .cartesian_product(0..9)
        .collect::<Vec<(usize, usize)>>();
    let possible_locations = items.choose_multiple(&mut rng, 2);

    for location in possible_locations {
        dbg!(location);
    }
}