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Concurrency in Rust is extremely easy, because it safe by design. Just import rayon crate and change iter() to par_iter() [1]. Compiler will point out to problems, e.g. it will not allow to send a type, which cannot be used concurrently, until it will be wrapped by Arc (atomic reference counter).

[1]: https://docs.rs/rayon/1.0.3/rayon/

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