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[kierans <>]

I experimented with the 4-th parameter to compute_intersection_points() and
set it to true. 

I now get:

Found 9 intersection points:
1/1 1/1
1/1 5/1
3/1 1/1
-21/-7 -21/-7
-3/-1 -5/-1
3/1 8/1
-35/-7 -35/-7
8/1 5/1
8/1 8/1

I would have expected to get 5 points of intersection (the additional two
points at (8,8) and (8,5). What I get instead is all the endpoints of the 4
lines + the three original points of intersection.

Still haven't found a way to report the 5 points of intersection that I can
see working the example on paper.

Cheers,

Kieran



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