Dispay Unit Type Abbreviation

    [Transaction(TransactionMode.ReadOnly)]
    public class Command : IExternalCommand
    {
        public Result Execute(
          ExternalCommandData commandData,
          ref string message,
          ElementSet elements)
        {
            DisplayUnitType n
      = DisplayUnitType.DUT_GALLONS_US;

            string valid_unit_symbols;

            for (DisplayUnitType i = DisplayUnitType
              .DUT_METERS; i < n; ++i)
            {
                var validUnitSymbols = FormatOptions.GetValidUnitSymbols(i);

                foreach (var validUnitSymbol in validUnitSymbols)
                {
                    if (validUnitSymbol != UnitSymbolType.UST_NONE)
                    {
                        var abbrUnitTypeLabel = LabelUtils.GetLabelFor(validUnitSymbol);
                        Debug.Print("{0} - {1}", abbrUnitTypeLabel, LabelUtils.GetLabelFor(i));
                    }
                }

            }
            return Result.Succeeded;
        }
    }