Any party to the representation or unfair labor practice case may, within 14 days after service thereof, respond to the petition, admitting or denying its allegations. Eight copies of such response shall be filed with the Board in Washington, DC. Such response shall be printed or otherwise legibly duplicated: Provided, however, That carbon copies of typewritten materials will not be accepted. Such response shall be served on the general counsel and all other parties, and a statement of service shall be filed as provided by Sec. 102.114(b) of these rules. [51 FR 23749, July 1, 1986]