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Start at 2017-07-28 10:00:00 End at 2017-08-27 20:00:00

Started 7 years Ended 7 years

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#	Origin	Name
A	HDU 2215	Maple trees
B	HDU 2108	Shape of HDU
C	HDU 1086	You can Solve a Geometry Problem too
D	HDU 1115	Lifting the Stone
E	HDU 1392	Surround the Trees
F	HDU 1147	Pick-up sticks
G	HDU 2202	最大三角形
H	HDU 3661	Assignments