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use itertools::Itertools;
pub fn verse(n: u32) -> String {
match n {
0 => format!( "No more bottles of beer on the wall, no more bottles of beer.\n\
Go to the store and buy some more, 99 bottles of beer on the wall.\n"),
1 => format!( "1 bottle of beer on the wall, 1 bottle of beer.\n\
Take it down and pass it around, no more bottles of beer on the wall.\n"),
2 => format!( "2 bottles of beer on the wall, 2 bottles of beer.\n\
Take one down and pass it around, 1 bottle of beer on the wall.\n"),
_ => format!( "{} bottles of beer on the wall, {} bottles of beer.\n\
Take one down and pass it around, {} bottles of beer on the wall.\n",
n, n, n - 1)
}
}
pub fn sing(start: u32, end: u32) -> String {
// Note: call to `join` can be substituted with `.intersperse(String::from("\n")).collect()`
(end..=start).rev().map(|x| verse(x)).join("\n")
}
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