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Takes a set of points and returns an undirected graph of those points
which are near each other.
The points are represented by three vectors, x, y and
z, which must all be the same length, n.
The ith point is at position (x(i),y(i),z(i)).
The value returned is a vector v of vectors of exact nonnegative
The vectors of integers v(i) represent the set of points near
the ith point.
If the point (x(i),y(i),z(i)) is within distance d of
(x(j),y(j),z(j)), then i will appear in v(j) and
j will appear in v(i).
A point is never in its own set of neighbours.
Sat May 8 16:42:57 EDT 1999