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Difficulty
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4067
Electronic Hunting
Very hard
4079
Permutation
Very easy
4086
Triangle
Very hard
4098
Prime Substring
4101
Three digit numbers
Medium
4106
Subsets generation
Very easy
4122
Periodic, My Dear Watson
Easy
4136
The Dragon and the knights
4193
Fir Trees
Easy
4203
Box of chocolate
Medium
4204
The Millionaire's Will
Easy
4207
Bulls and cows
Hard
4210
Broken Scales
Easy
4236
Cloudlet
Very hard
4242
Puzzle
Very easy
4267
Babs` Box Boutique
Very easy
4269
Hexagon Perplexagon
Very easy
4272
Road Series
Easy
4287
Stepan and Matches
Very easy
4298
Magical Bridges
Easy
4300
Ancient Scrolls
4304
Communication with the organizers
Very hard
4338
Ritual Wall
4345
Special Words
Easy
4353
Happy Birthday!!!
Very easy
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