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4640
Domino
Medium
4641
Cliffs
Easy
4642
Conveyor
Very hard
4643
News
Hard
4644
Lotto
Hard
4646
Cave
Hard
4647
Black-and-white cube
Very easy
4648
One-two
Very easy
4649
Optimal Cutting
Very easy
4650
Graph Tournament
Very hard
4651
A lock in the form of a mini-game
Hard
4652
Number of requests
Very hard
4653
Two permutations
Hard
4654
Robot horse
Very hard
4655
Hop-skip
Hard
4656
Suffix tree
Very hard
4657
Suffix tree of two strings
Very hard
4658
Unique suffixes
Very hard
4659
Common Substring
Very easy
4660
Controlling set of strings
Medium
4661
Gold Mines
Very easy
4662
Chords
Hard
4663
A Coloring Game
Hard
4664
Hippopotamus
Medium
4665
False RSA
Very easy
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