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1
Parallelepiped
2
Grandchildren
3
Colorful Balls
4
Colorful String
5
Painting stones
6
Pairwise Product
7
Sashko-Array Constructor
8
Sets
9
Pies
10
Arithmetic Mean
11
Cossack Vus and Friend at CP Olympiad
12
Add and Minimize
13
Magic Knights
14
Trivial? Solve It!
15
Rook
16
Coordinates
17
Sleepy Sasha is Trouble at the University
18
Bohdan against "tails"
19
Pasha is also against "tails"?
20
Anton buys a piglet