docs: private static ICommonsSet <LocalDate> _getEthiopianOrthodoxHolidaysInGregorianYear (final int nGregorianYear,
                                                                                         final int nEOMonth,
                                                                                         final int nEODay)
    {
      return CalendarHelper.getDatesFromChronologyWithinGregorianYear (nEOMonth,
                                                                       nEODay,
                                                                       nGregorianYear,
                                                                       CopticChronology.INSTANCE);
    }