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#[macro_export]
macro_rules! cfor {
    ($init: stmt; $cond: expr; $step: expr; $body: block) => {
        {
            let mut first = true;
            $init;
            while {
                if first {
                    first = false
                } else {
                    $step
                }

                $cond
            } $body
        }
    }
}