[postgis-users] illustration for relations

[Willy-Bas Loos]

Are there any illustrative drawings available for the (GEOS or not) Geometry
Relationship/Processing Functions in postgis?
I've looked on http://geos.refractions.net/ on
http://www.jump-project.org/(has some but not all) and tried with
google, but to no avail.
This seems like a basic part of documentation to me.
Anyone?
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