There can be no simply connected polyhedron with those values since they are not consistent with the Euler characteristic.
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12 edges 6 faces 8 corners
It has 6 faces, 12 edges and 8 corners or vertices
One has 6 faces, 8 edges and 8 corners.
flat surfaces: 6 faces: 6 edges: 12 corners: 8
Cuboid has : 8 corners (vertices) 12 edges 6 faces