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Reports methods with three or more negations.
Such methods may be confusing.
<p><b>Example:</b></p>
<pre><code>
  void doSmth(int a, int b, boolean flag1, boolean flag2) {
    if (!flag && !flag2) {
      if (a != b) {
        doOther();
      }
    }
  }
</code></pre>
<p>Without negations, the method becomes easier to understand:</p>
<pre><code>
  void doSmth(int a, int b, boolean flag1, boolean flag2) {
    if (flag1 || flag2 || a == b) return;
    doOther();
  }
</code></pre>
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