A directed graph with 27 vertices: QRgraph(27)

The 27x27 adjacency matrix is this (complete the upper triangle by use of antisymmetry):

  0
  1  0
 -1  1  0
 -1 -1  1  0
  1 -1 -1  1  0
 -1  1 -1 -1  1  0
  1 -1  1 -1 -1  1  0
  1  1 -1  1 -1 -1  1  0
 -1  1  1 -1  1 -1 -1  1  0
  1 -1 -1  1  1  1 -1  1  1  0
 -1  1 -1  1  1  1  1 -1  1  1  0
 -1 -1  1  1  1  1  1  1 -1 -1  1  0
 -1  1  1  1 -1 -1  1  1  1 -1 -1  1  0
  1 -1  1 -1  1 -1  1  1  1  1 -1 -1  1  0
  1  1 -1 -1 -1  1  1  1  1 -1  1 -1 -1  1  0
  1  1  1 -1  1  1  1 -1 -1  1 -1  1 -1 -1  1  0
  1  1  1  1 -1  1 -1  1 -1  1  1 -1  1 -1 -1  1  0
  1  1  1  1  1 -1 -1 -1  1 -1  1  1 -1  1 -1 -1  1  0
 -1  1  1  1 -1 -1 -1 -1 -1  1 -1 -1  1  1  1 -1  1  1  0
  1 -1  1 -1  1 -1 -1 -1 -1 -1  1 -1  1  1  1  1 -1  1  1  0
  1  1 -1 -1 -1  1 -1 -1 -1 -1 -1  1  1  1  1  1  1 -1 -1  1  0
 -1 -1 -1 -1  1  1  1 -1 -1 -1  1  1  1 -1 -1  1  1  1 -1 -1  1  0
 -1 -1 -1  1 -1  1 -1  1 -1  1 -1  1 -1  1 -1  1  1  1  1 -1 -1  1  0
 -1 -1 -1  1  1 -1 -1 -1  1  1  1 -1 -1 -1  1  1  1  1 -1  1 -1 -1  1  0
  1 -1 -1 -1 -1 -1 -1  1  1  1  1  1 -1  1  1  1 -1 -1  1 -1  1 -1 -1  1  0
 -1  1 -1 -1 -1 -1  1 -1  1  1  1  1  1 -1  1 -1  1 -1  1  1 -1  1 -1 -1  1  0
 -1 -1  1 -1 -1 -1  1  1 -1  1  1  1  1  1 -1 -1 -1  1 -1  1  1 -1  1 -1 -1  1  0

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