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  1. or download this
       (85,45)    90     (85,135)
      +--------|--------+
...
      |        |         |
      +--------|--------+
   (85,315)   270     (85,225)
  2. or download this
    nnn-a, 85, 90, 0, 180
nnn-b, 85, 90, 180, 360