use std::collections::HashMap;

fn main() {
    // Type inference lets us omit an explicit type signature (which
    // would be `HashMap<String, String>` in this example).
    let mut book_reviews = HashMap::new();
    let mut book_reviews2 = HashMap::new();

    book_reviews.insert("wg1".to_string(), "heheho".to_string());
    book_reviews.insert("wg2".to_string(), "ohhh".to_string());
    book_reviews.insert("wg3".to_string(), "snow".to_string());

    book_reviews2.insert("wg1".to_string(), "blahbloh".to_string());
    book_reviews2.insert("wg2".to_string(), "hihho".to_string());

    for (a, b) in book_reviews.iter().zip(book_reviews2.iter()) {
        println!("{:?} \n {:?}", a, b)
    }
}