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Something strange?

w_wrong00 The concept of "Something strange"
w_wrong01 Tracks of incenter・excenter
Track of incenter

Doubt (1)

Track of excenter

Doubt (2)

Excenter are three.

Incenter and excenter are brothers

w_wrong02 Number of common tangent lines
Starting point

First result

Background of the odd number

Forum of Gemetric Constructor by Y.Iijima