      - A 2D finite-element mesh with 1024 nodes.
  grid5          - 2D square 5-point mesh.
  grid7          - 2D square 7-point mesh.
  grid9          - 2D square 9-point mesh.
  gridt          - 2D triangular mesh.
  grid3d         - 3D cubical mesh.
  grid3dt        - 3D cubical simplicial mesh.
  badmesh        - A mesh that has no good straight-line cut.
  cockroach      - A mesh for which spectral bisection does poorly.
  treexpath      - A mesh for which spectral bisection does poorly.

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