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Arnulfo Hein

@arnulfohein17

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Arnulfo Hein became a registered member 1 year, 5 months ago

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Recent Series

小迪知识录 (3)
Durtles Problems of the Weeks (95)
小辉与小希 (3)
a softer world (1)
小丹故事集 (18)

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Meeting Name Cards I
Angles of Intersecting Chords
Factors of Non-Integers
Distance Sums
Centers at a Corner

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