let mut best = adj
    .values()
    .map(|bb| {
        bb.iter().fold(Vec::<String>::new(), |mut clique, b| {
            if clique.iter().all(|c| adj[b].contains(c.as_str())) {
                clique.push(b.to_string());
   }

            clique
        })
    })
    .max_by_key(|c| c.len())
    .unwrap();

best.sort();

println!(
    "{}",
    best.iter()
        .map(ToString::to_string)
        .collect::<Vec<_>>()
        .join(",")
);