Assertion: octahedron's edge | /r/CapableOf | lie along the x-axis
Facets:
Source sentences:
text: For an unit (i.e.: with side length 1) isohedral rhombohedron, with rhombic acute angle θ {\displaystyle \theta ~} , with one vertex at the origin (0, 0, 0), and with one edge lying along the x-axis, the three generating vectors are