Known will remind knower how unknown relates to knowable, in return knowable can remind known that it is an action of mental.
Close will remind passage how open relates to barrier, in return barrier can remind close that it is an action of door.

Unknown stimulates knowable but references knower.
Open stimulates barrier but references passage.

q1r will remind q1s how q1e relates to q1o, in return q1o can remind q1r that it is an action of q1n.
q1r will remind q1s how q1e relates to q1o, in return q1o can remind q1r that it is an action of q1n.

q1e stimulates q1o but references q1s.
q1e stimulates q1o but references q1s.