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boundary01|POINT EMPTY
boundary02|MULTIPOINT EMPTY
boundary03|MULTIPOINT((1 1),(-1 1))
boundary04|MULTIPOINT EMPTY
boundary05|LINESTRING(1 1,0 0,-1 1,1 1)
boundary06|LINESTRING(1 1 1,0 0 1,-1 1 1,1 1 1)
boundary07|MULTILINESTRING((1 1 1,0 0 1,-1 1 1,1 1 1),(1 1 1,0 0 1,-1 1 1,1 1 1))
boundary08|MULTIPOINT(1 1 1,-1 1 1)
boundary09|MULTIPOINT(1 1 1,1 1 0.5)
boundary10|MULTIPOINT EMPTY
boundary11|LINESTRING(1 1,0 0,-1 1,1 1)
boundary12|MULTILINESTRING((30 20,45 40,10 40,30 20),(15 5,40 10,10 20,5 10,15 5),(30 20,45 40,10 40,30 20),(15 5,40 10,10 20,5 10,15 5))
boundary13|MULTILINESTRING((0 0,0 -1,-1 1,0 0),(0 0,1 0,0 -1,0 0))
boundary14|LINESTRING(0 0,0 -1,-1 1,0 0)
boundary15|MULTICURVE(CIRCULARSTRING(0 0,4 0,4 4,0 4,0 0),(1 1,3 3,3 1,1 1))
boundary16|MULTIPOINT(1 1 1,-1 1 1)
boundary17|MULTILINESTRING((0 0,0 10,10 10,10 0,0 0),(2 2,4 2,4 4,2 4,2 2),(2 2,2 4,4 4,4 2,2 2))
boundary18|MULTILINESTRING((0 0,0 -1,-1 1,0 0),(0 0,1 0,0 -1,0 0),(10 10,10 20,20 20,10 10))
boundary19|MULTILINESTRING((0 0,5 5,10 0,0 0),(3 1,7 1,5 2,3 1),(20 0,20 5,25 5,20 0))
boundary20|MULTIPOINT EMPTY
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