Assertion: tetrahedron | /r/CapableOf | rest on four 9m tall concrete pillars
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Source sentences:
text: The Tetrahedron in Bottrop (German: Bottrop Tetraeder or officially Haldenereignis Emscherblick) is a walkable steel structure in the form of a tetrahedron with a side length of 60m, resting on four 9m tall concrete pillars.