Applications of mathematics occasionally produce models that are best understood and visualized as directed or undirected graphs. Computer aids to mathematicians can contribute to the understanding and communication of this information, especially if well-integrated into the problem-solving working environment of the investigator. This particular exercise was prompted by a paper  by a colleague, F. Alberto Grünbaum. The particular need in Grünbaum's paper is to describe a graph relating input and output states via a matrix of probabilities. The paper's illustrative graph is of relatively small size (24 nodes, 60 edges), but its display required careful "manual" rearrangement
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