Check if the Sentence Is Pangram LeetCode solution in Java

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class Solution {
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  public boolean checkIfPangram(String sentence) {
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    int seen = 0;
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    for (char c : sentence.toCharArray()) {
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      int ci = c - 'a';
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      seen = seen | (1 << ci);
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    }
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    return seen == ((1 << 26) - 1);
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  }
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}