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6242
Multiplication in a Dihedral Group
Easy
6244
Sharkovski`s Ordering
Very easy
6246
More Fun in Bicol
Very hard
6253
Virus Replication
Very easy
6254
Timebomb
Very easy
6255
Erase Securely
6260
Arrangement of Contest
Very easy
6261
Ballot Analyzing Device
Very easy
6268
Intellectual Property
Very hard
6275
Doubling
Very easy
6279
Number of days in a month
Very easy
6281
Bank
Easy
6282
Ставка
6284
Illness
Easy
6285
Division of the Kingdom
Very easy
6290
Suprematism
Medium
6291
ASCII Art
6295
Exchange
Very hard
6300
Java vs C++
Very easy
6313
Palindrome
Medium
6314
Hotel of the Planet Shelezyaka
6321
Matches
Very hard
6322
Candies
Easy
6350
Sparkling water
Very easy
6351
The economy must be economical!
Medium
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