Assertion: ball | /r/HasProperty | positioned in the middle of the rack
Facets:
Source sentences:
text: The 10 balls are racked in a triangle as in the game of eight-ball (but with 10 instead of 15 object balls, forming a tetractys), with the 1 ball positioned at the apex of the rack, the 2 and 3 balls on the bottom corners of the triangle (non-specific), the 10 ball positioned in the middle of the rack, and the other balls placed randomly throughout, with the apex ball on the foot spot.