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551
Code Permutations
559
Велосипед
Medium
561
Interesting equation
Very hard
563
Simple equation
Very easy
572
The Lesson of mathematics
Very easy
575
Sequence (RU)
576
Office
Very easy
577
Book
Very easy
582
Sequence 2
Easy
583
Airplane (RU)
Hard
596
Торговые сделки в Амбере
614
Buying fruits
Medium
616
Radars (RU)
Very easy
617
Lotto (RU)
Easy
624
DVD (RU)
Hard
627
Unloved digits
Easy
630
Anti-prime Sequences
631
Mondriaan`s Dream
Very easy
637
Bone for the Sharik
Very easy
638
Indivisibility of binomial coefficients
Easy
641
Number of quadratic residues
Easy
643
Triangular Room
Easy
646
Jumps on strip
Hard
649
Factorial and fourth degree
Hard
672
Квадроквадратуры
Medium
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