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Probably the easiest way to think about this in terms of a union of the "is disjoint" and "touches only on the borders" cases. Those relationships are (imaginatively) known as "disjoint" and "touches". Here is an example in SpatiaLite: spatialite> SELECT ST_Touches(GeomFromText("POLYGON((0 0, 0 1, 1 1, 1 0, 0 0))"), GeomFromText("POLYGON((0 1, 0 2, 1 ...



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