station and shall report on the selection in writing to the competent Gu/Si/Gun election commission not later than seven days before the election day, but may replace the observers with other persons at any time after reporting, as necessary, and may report on such replacement at an early voting polling station during the early voting period. <Amended on Jan. 17, 2014> (3) If there is no early voting observer selected in accordance with paragraph (2) or if there are early voting observers selected only by a candidate, the competent Gu/Si/Gun election commission may select early voting observers to fill the vacancies to the extent that the number of observers reaches four persons, from among eligible voters, with the eligible voters’ consent thereto. <Amended on Aug. 4, 2005; Jan. 17, 2014> (4) Article 161 (6) through (12) shall apply mutatis mutandis to early voting observers. In such cases, "Eup/Myeon/Dong election commission" shall be construed as "competent Gu/Si/Gun election commission", "official in charge of voting management" as "official in charge of early voting management", and "voting observer" as "early voting observers". <Amended on Feb. 16, 2000; Aug. 4, 2005; Jan. 25, 2010; Jan. 17, 2014; Aug. 13, 2015> (5) The form of the report on early voting observers and other necessary matters shall be prescribed by the National Election Commission Regulations. <Amended on Jan. 17, 2014> Article 163 (Restriction on Access to Polling Stations) (1) No one shall enter a polling station, except for an eligible voter, voting observer, official in charge of voting management, the members and employees of the Eup/Myeon/Dong election commission and the superior election commission, and polling station staff. <Amended on Aug. 4, 2005> (2) A member and employee of an election commission, official in charge of voting management, polling station staff of an election commission and voting observer shall, upon entering or leaving a polling station, wear or attach the mark prescribed by the National Election Commission Regulations, and shall not wear or attach anything else in relation to the election other than the mark provided for in this provision. <Amended on Aug. 4, 2005> (3) The mark provided for in paragraph (2) shall not be transferred or conceded to another person. (4) Paragraphs (1) through (3) shall apply mutatis mutandis to the restriction on entry into early voting polling stations (including places where polling booths are installed in accordance with Article 149). <Amended on Jan. 17, 2014> Article 164 (Maintenance of Order in Polling Stations) (1) Where it is deemed impossible to hold a fair election due to serious disturbance of the order at a polling station, officials in charge of voting management or polling station staff may request for assistance to a police officer in uniform or the chief of a police station to maintain the order at a polling station. <Amended on Aug. 4, 2005>