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画質 高画質

Problem 1230: 60 Degrees,# Congruence, Metric Relations

Details: https://t.co/CvxEkxo4v4

1 2
2016-07-06

Problem 800: de Gua's Theorem, Pythagorean theorem in 3-D

Details: https://t.co/MIDNBStq5t

3 8
2016-06-10