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impl Solution {
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  pub fn is_anagram(s: String, t: String) -> bool {
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    let mut map = std::collections::HashMap::new();
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    s.chars().for_each(|c| *map.entry(c).or_insert(0) += 1);
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    t.chars().for_each(|c| *map.entry(c).or_insert(0) -= 1);
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    !map.into_values().any(|count| count != 0)
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  }
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}