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Implement intro2
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// Execute `rustlings hint intro2` or use the `hint` watch subcommand for a
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// Execute `rustlings hint intro2` or use the `hint` watch subcommand for a
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// hint.
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// hint.
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// I AM NOT DONE
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fn main() {
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fn main() {
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println!("Hello {}!");
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println!("Hello {0}!", "world");
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}
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}
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