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Problems

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Difficulty
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4120
Robot Navigation
Medium
4136
The Dragon and the knights
Hard
4163
Convex Permutomino
Hard
4223
Enchanted Music Boxes
Medium
4252
Region
Medium
4263
30 chairs
Very easy
4266
Appease Inti
Very hard
4270
Backgammon Array Mapping
Easy
4306
Sets
Easy
4335
Feathers on the Shaman's Head
Very hard
4338
Ritual Wall
Hard
4343
Flags for Provinces
Hard
4436
Lexicographic order
Medium
4441
Formation
Easy
4445
Peaceful Queens
Very easy
4449
Peaceful Queens - 2
Medium
4519
Sages
Hard
4594
Bims
Very easy
4627
Hexagon
Hard
4629
Hexagonal Routes
Hard
4644
Lotto
Hard
4655
Hop-skip
Hard
4663
A Coloring Game
Hard
4836
Combinations 1
Very easy
4838
Correct bracket sequences
Medium
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