Assertion: icosahedron's dodecahedron | /r/MadeOf | copper alloy
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Source sentences:
text: A Roman dodecahedron or Gallo-Roman Dodecahedron is a small hollow object made of copper alloy which has been cast into a dodecahedral shape: twelve flat pentagonal faces, each face having a circular hole of varying diameter in the middle, the holes connecting to the hollow center.