src/main/java/org/apache/log4j/rule/TimestampEqualsRule.java [85:106]:
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    if (result && matches != null) {
        Set entries = (Set) matches.get(LoggingEventFieldResolver.TIMESTAMP_FIELD);
        if (entries == null) {
            entries = new HashSet();
            matches.put(LoggingEventFieldResolver.TIMESTAMP_FIELD, entries);
        }
        entries.add(eventTimeStampString);
    }
    return result;
  }

  /**
    * Deserialize the state of the object.
    *
    * @param in object input stream
    *
    * @throws IOException if IO error during deserialization
    * @throws ClassNotFoundException if class not found during
   *   deserialization
    */
   private void readObject(final java.io.ObjectInputStream in)
     throws IOException, ClassNotFoundException {
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src/main/java/org/apache/log4j/rule/TimestampInequalityRule.java [105:125]:
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    if (result && matches != null) {
        Set entries = (Set) matches.get(LoggingEventFieldResolver.TIMESTAMP_FIELD);
        if (entries == null) {
            entries = new HashSet();
            matches.put(LoggingEventFieldResolver.TIMESTAMP_FIELD, entries);
        }
        entries.add(eventTimeStampString);
    }
    return result;
  }

  /**
    * Deserialize the state of the object.
    *
    * @param in object input stream
    *
    * @throws IOException if IO error during deserialization
    * @throws ClassNotFoundException if class not found
    */
   private void readObject(final java.io.ObjectInputStream in)
     throws IOException, ClassNotFoundException {
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