Assertion: octahedron | /r/CapableOf | meet tetrahedron
Facets:
value: in the next layer
type: LOCATION
Source sentences:
text: Because the faces on the planes separating these layers form a regular pattern of triangles, adjacent layers can be placed so that each octahedron in one layer meets a tetrahedron in the next layer, or so that each cell meets a cell of its own kind (the layer boundary thus becomes a reflection plane).