code: public static <T> Level0SetOperator<Set<T>,T> onSetFor(final T... elements) {
          return new Level0SetOperator<Set<T>,T>(ExecutionTarget.forOp(VarArgsUtil.asRequiredObjectSet(elements), Normalisation.SET));
      }
docs: <p>
  Creates a set with the specified elements and an <i>operation expression</i> on it.
  </p>
  
  @param elements the elements of the set being created
  @return an operator, ready for chaining