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Difficulty
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4267
Babs` Box Boutique
Very easy
4269
Hexagon Perplexagon
Very easy
4270
Backgammon Array Mapping
Easy
4272
Road Series
Easy
4287
Stepan and Matches
Very easy
4298
Magical Bridges
Easy
4304
Communication with the organizers
Very hard
4345
Special Words
Easy
4353
Happy Birthday!!!
Very easy
4358
T-shirter
Easy
4388
Meeting place can not be changed
Easy
4409
Loopy transit
Medium
4432
Tom Sawyer and His Friends
Easy
4436
Lexicographic order
Medium
4450
Dominant Queens
Easy
4514
Sorting of Railcars - A
Medium
4525
Boustrophedon
Medium
4526
Ichthyology
Medium
4557
Lonely king
Very easy
4573
Quadratic Permutation High
Easy
4574
Quadratic Permutation Junior
Very easy
4609
Quiz
Very easy
4635
The Programmer`s Hex
Very hard
4676
Number of palindromes
Medium
4684
Lucky ticket
Very hard
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