fn main() {
    let days = ["first","second","third","fourth","fifth","sixth",
                "seventh", "eighth", "ninth", "tenth", "eleventh",
                "twelth"];
    let presents = ["a partridge in a pear tree", "2 turtle doves",
                    "3 french hens", "4 calling birds", "5 golden rings",
                    "6 geese a laying", "7 swans a swimming",
                    "8 maids a milking", "9 ladies dancing",
                    "10 lords a leaping", "11 pipers piping",
                    "12 drummers drumming"];

    for day in 0..12 {
        println!("On the {} day of Christmas my true love gave to me...",
                 days[day]);

        for p in (0..day+1).rev() {
            if p == 0 {
                println!("  {}{}.", if day != 0 { "and " } else { "" },
                         presents[p]);
            } else {
                println!("  {},", presents[p]);
            }
        }
        println!("");
    }
}