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Benchmark 4. (a) Original grid composed by 12 302 2d-cells and 35 153 VEM dof and coarsened grid composed by 4599 2d-cells and 18 803 VEM dof. (b) A zoom on almost intersecting fractures for the original and coarsened grids, respectively. The zoom is referred to the small rectangle at position, approximately (360, 350).