Each group of names of candidates for a particular office shall be separated from the succeeding group. Each series of groups shall be headed by a caption that reads “President of the United States,” “President and Vice President,” “State,” “United States Senator,” “United States Representative,” “State Senator,” “Member of the State Assembly,” “County,” or “City” or other proper general classification, as the case may be, printed in at least 10-point bold type. Each caption shall be separated from the names of the candidates beneath.