Regulations Respecting the Employment of Persons for One or More Specified Periods of Less Than Three Months Totalling Less Than Six Months in the Aggregate During Any Consecutive 12-Month Period in the Department of External Affairs in the Clerical and Regulatory Group and the Secretarial, Stenographic, Typing Group of the Administrative Support Category, in the Administrative Services Group of the Administrative and Foreign Service Category, and in the Social Science Support Group of the Technical Category During the Period Beginning on April 1, 1993 and Ending on December 31, 1993