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(1) The members of the Federal Council and their substitute members are elected by the Diets for the duration of their respective legislative periods in accordance with the principle of proportional representation but at least one seat must fall to the party having the second largest number of seats in a Diet or, should several parties have the same number of seats, the second highest number of votes at the last election to the Diet. When the claims of several parties are equal, the issue shall be decided by lot.