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[Hyungon Kim <>]

Hi,

Thanks for your help.
That's right. The issue is the shape. My expected result from scan-line is
     
  +----------+                         +----------+
  |               |                         |              |
  |  +--+       |                =>     |  +--+      |
  |  |    |  +--+-+                     |  |    |      +--+
  |  |    +-+--+  |                     |  |    +-+       |
  |  +-----+      |                     |  +-----+       |
  +-------------+                     +-------------+

It is why I suppose that Arrangement may have two outer boundaries from one
self-intersected polygon.
I will try your suggested ways.

Thanks,
Hyungon

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