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1815
Top This
Very easy
1819
Lawn mower
Very easy
1842
Triangle
Very easy
1852
Product
Hard
1854
Triangular King
Very easy
1856
Championship on fungi Sports
Very easy
1870
Testing shuffle machines
Very easy
1871
Squirrel and bamboo
Very easy
1874
Святкові дні
Hard
1877
Валидатор к игре в тетрис
Hard
1885
Количество линий
Very easy
1886
Восстановление количества очков
Medium
1891
Chine
1899
Прохождение коридора
Easy
1915
Numbers
Very easy
1916
English
Easy
1919
Automatic Input Verifier
Very hard
1931
XYZX 2009
Very easy
1949
Cake
Very easy
1950
School algebra
Easy
1951
IP-address
Very easy
1952
Contr-operation
1954
Mosaic
1955
Calendar
Very easy
1956
The young hacker
Very easy
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