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2017 Sudoku R1 IB question

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in the instructions for 15 "Unique Order Sums Sudoku" it says that Cage 1 is the lowest and Cage 12 is the highest. Does this imply that there will be 12 cages on the competition? I don't think this matters very much, but I would like to clarify, since the wording is strange to me. Thanks.