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7015
Card Trick
Medium
7244
New Contest
7261
Difficult path
Very easy
7264
A fish lunch
Easy
7265
The secret code
Easy
7268
A granite of science
Very hard
7269
Probable diagnosis
Hard
7270
Zoological experiment
Easy
7271
A game
Easy
8182
Butterfly Effect
Easy
8496
Casino
8511
Random
Very hard
9111
Airport Check-in
9114
DotA Quals
9586
Game Relics
Easy
11137
First to Solve
11747
Metro quiz
Hard
11753
Throwing dice
Easy
1
2
3
4
5
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