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4004
Is there a cycle?
Very easy
4011
Piece it together
Very easy
4013
Pool construction
Hard
4014
Smoking gun
Hard
4017
Train delays
Medium
4022
Admiral
Easy
4028
Guards
Easy
4047
Peaks
Hard
4050
Strategic Game
Easy
4063
Preparation for the Holiday
Hard
4064
Extended Bowling Alley
Hard
4069
Toll Roads
Very hard
4087
Longest path
Very easy
4089
Ideal Path
Easy
4104
Distance in Tree
Very easy
4112
Military base
Easy
4114
Heavy Cargo
Very easy
4120
Robot Navigation
Medium
4127
Operation: Merchant Boorinei
Easy
4128
Kingdoms
Very easy
4131
Non-boring sequences
Very easy
4132
Word equations
Very easy
4133
Farm and factory
Very easy
4137
Conservation
Hard
4138
Graphic Madness
Very hard
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