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4405
Multi-touch gesture classification
Very hard
4406
Stacking Curvy Blocks
4407
Unicycle counting
4408
Choosing Numbers
Very hard
4409
Loopy transit
4410
Hitting the Targets
4411
Texas Summers
4412
Out of context
4413
Maze movement
Very hard
4414
Ragged Right
4416
Testing System
Very easy
4417
Number
Very easy
4418
Lexicographical order
Medium
4419
Dense forest
Very easy
4420
The root of a cubic equation
Very easy
4421
For fans of statistics
Easy
4422
Trains
Medium
4423
Transfer points
Very easy
4424
Union of segments
Very easy
4425
Further solving
Very easy
4426
Minimum Coverage
Easy
4427
Chinese clock
Medium
4428
Intersection of Rectangles
Very easy
4429
Kasi
Easy
4430
Points and Line Segments
Easy
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