A1 - Balanced Shuffle (Easy) A2 - Balanced Unshuffle (Medium) A3 - Balanced Unshuffle (Hard) B1 - Exact Neighbours (Easy) B2 - Exact Neighbours (Medium) B3 - Exact Neighbours (Hard) C2 - Game on Tree (Medium) F - Playing Quidditch (Easy, Medium, Hard) G1 - Min-Fund Prison (Easy) G2 - Min-Fund Prison (Medium) G3 - Min-Fund Prison (Hard)
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