code: public static <T extends Comparable<T>> RelationalOperator<T> lessThanEqualToOrGreaterThanEqualTo(T lowerBound, T upperBound) {
      return ComposableRelationalOperator.compose(lessThanEqualTo(lowerBound), LogicalOperator.OR, greaterThanEqualTo(upperBound));
    }
docs: Gets the RelationalOperator performing less than equal to or greater than equal to comparisons to determine whether
  all provided values are less than equal to some upper bound value or possibly greater than equal to some lower
  bound value.
  
  @param lowerBound the Comparable upper bounded value.
  @param upperBound the Comparable lower bounded value.
  @param <T> the expected Class type for the object used in the less than equal to or greater than equal to
  comparison.
  @return a RelationalOperator for the less than equal to or greater than equal to comparison.