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The region of is
the region between the disc with centre and radius 3 excluding the boundary points and the disc with centre and radius 1 excluding the boundary points
the region between the disc with centre and radius 3 and the disc with centre and radius 1 including the boundary points
the region between the disc with centre and radius and the disc with centre and radius 1 excluding the boundary points
the region between the disc with centre and radius 3 and the disc with centre and radius 1 excluding the boundary points
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