Describe close using [ dividing, limiting, between, region ] as the four quadrants.
Describe open using [ continuation, space, hole, accessible ] as the four quadrants.

There is nothing either region or between, but dividing makes it so.
There is nothing either accessible or hole, but continuation makes it so.

Describe q1n using [ q1e, q1r, q1o, q1s ] as the four quadrants.
Describe q1n using [ q1e, q1r, q1o, q1s ] as the four quadrants.

There is nothing either q1s or q1o, but q1e makes it so.
There is nothing either q1s or q1o, but q1e makes it so.