.10 Holidays.—The Board has determined that the Exchange will not be open for business on New Year's Day, Martin Luther King, Jr. Day, Washington's Birthday, Good Friday, Memorial Day, Independence Day, Labor Day, Thanksgiving Day and Christmas Day. Martin Luther King, Jr. Day, Washington's Birthday and Memorial Day will be celebrated on the third Monday in January, the third Monday in February and the last Monday in May, respectively

The Exchange Board has also determined that, when any holiday observed by the Exchange falls on a Saturday, the Exchange will not be open for business on the preceding Friday and when any holiday observed by the Exchange falls on a Sunday, the Exchange will not be open for business on the succeeding Monday, unless unusual business conditions exist, such as the ending of a monthly or the yearly accounting period.