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A pair of generating units for D3a and, 
below, the non-minimal balance 
surface D3'a (obtained by using 
Surface Evolver to minimise the 
integrated mean curvature).

  

 

Portion of D2c consisting of 
four generating units.

Four dodecagonal patches of 
Schoen’s C(D)
    

 

 

A stereo pair of images of the unit cell of Schoen’s C(D).
  

   

  

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