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4882
Football Paradoxes
Easy
4883
Tic-tac-toe
Medium
4884
Goosebumps on a Cubic Earth
Very easy
4885
The best comb
Easy
4886
Fortress
Hard
4887
Numbers
Easy
4888
Dodecahedron
4889
Little Chess Nim
4890
Subtraction
Easy
4891
How many variables?
4892
Replacement
Medium
4893
Brujo Don Pedro
Medium
4894
Interesting sequence
Easy
4895
Frog VS mosquito: the last fight!
Easy
4896
GCD
Hard
4897
Polynomials
4898
Very simple
Very easy
4899
Fortune Telling with Words
Easy
4900
Circles and Segments
4901
Secure PIN System Design
Hard
4902
Interval
4905
Hash function Dalla
Medium
4906
String Function Transformations
Very easy
4907
Transformation of String Functions: Inverse Problem
Medium
4914
UFOs
Very easy
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