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"A further variable affecting the make-up of electoral systems is the number of rounds of voting. Most ballots consist of one or two rounds but there are also systems with n rounds.
b. Two-round ballots: a second round of voting is habitually used where the leading candidate or list failed to obtain an absolute majority19 in the first round and this type of majority is necessary in order to be declared elected in the first round. It is therefore closely linked to the majority system.
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