use std::collections::HashMap;

fn main() {

    let values = vec!["a", "b", "c", "d", "e", "f"];

    let mut index = HashMap::new();

    for (idx, p) in values.iter().enumerate() {
        index.insert(idx, p);
    }

    for (k, v) in &index {
        println!("{:?} -> {:?}", k, v);
    }

    for v in &values {
        println!("{:?}", v);
    }

}