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moebius

       __
      /\ \   Moebius Strip
     / /\ \   (1/2 twist)
    / /__\ \
    \/____\/


       __
      /\ \   Moebius Strip
     / /\ \   (1 & 1/2 twists)
    / /__\_\
    \/_____/    mn



    _____________
   / ___________ \
  | /           \ |
  | \___________/\|
   \KCK__________/