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As the quarter-final stage nears its end, two student teams have one last chance to claim their spot in the semi-finals. Amol Rajan asks the questions.
Two more student teams return to play a second quarter-final, having lost their first. They need to win to stay in the competition. Amol Rajan asks the questions.
It's the last of the quarter-finals. Who will take the final place in the semis? Amol Rajan asks the questions.