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ch_drake
  Extremely simple test problem for diagnosing problem reported by
  Rich Drake, 1/29/02.
  See docs/internal/issues/alegra_020129.
  2D graph, 2x2 vertices equally spaced in [-.5,-.5]x[.5,.5].
  Graph and coordinates included.
  Vertex weights included.
  3 processor decomposition.
  Initial assignment specified.
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