Assertion: cube's shape | /r/HasProperty | deformed into tetrahedron
Facets:
value: by collapsing its square sides
type: MANNER
value: progressively
type: MANNER
Source sentences:
text: He called a cuboctahedron consisting of rigid struts connected by flexible vertices a "jitterbug" (this shape can be progressively deformed into an icosahedron, octahedron, and tetrahedron by collapsing its square sides).