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In page Oxford Union:

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Students running for election usually stand as part of a team, known as 'slates', enabling voters to support a designated candidate for each position and increase each candidates' vote count.[4] This practice has come under criticism recently due to the dominance of a single slate and the resulting unopposed elections. In Michaelmas 2018, a motion was passed banning slates for two terms followed by a referendum on the practice.[5]