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It's the last quarter-final, and only one place remains in the semi-finals - who will take it? Amol Rajan asks the questions.
The quarter-final stage nears its conclusion. Two places in the semi-finals are still up for grabs - both teams are hoping to take one of them. Amol Rajan asks the questions.
Two teams of students go head-to-head in the first of the semi-finals. Amol Rajan asks the questions.