*In order to save large and tangled graphs without getting recursive
unarchiving I decided to take the graph apart and archive it in the
form of a series of linear arrays. What I have now are two linear
arrays holding the elements of the graph. The elements themselves are
archived without any connection to other elements. I also have three
linear arrays where each object is a small array with NSNumber
instances. These three arrays show how the graph is to be reassembled
when loading.
As before, a small graph saves and loads fine (a hundred elements or
so). Increase ...*

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