src/main/java/org/apache/log4j/rule/EqualsRule.java [75:86]:
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  public static Rule getRule(final Stack stack) {
    if (stack.size() < 2) {
      throw new IllegalArgumentException(
        "Invalid EQUALS rule - expected two parameters but received "
        + stack.size());
    }

    String p2 = stack.pop().toString();
    String p1 = stack.pop().toString();

    return getRule(p1, p2);
  }
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src/main/java/org/apache/log4j/rule/LikeRule.java [82:92]:
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  public static Rule getRule(final Stack stack) {
      if (stack.size() < 2) {
          throw new IllegalArgumentException(
                  "Invalid LIKE rule - expected two parameters but received "
                          + stack.size());
      }

      String p2 = stack.pop().toString();
      String p1 = stack.pop().toString();
      return getRule(p1, p2);
  }
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