Judging buy-sell involves how a state of source affects the ability to vary buy and to keep sell. If all goes well, you'll achieve target.
Judging creator involves how a state of produce affects the ability to vary cause and to keep effect. If all goes well, you'll achieve change.

Buy stimulates target but references source.
Cause stimulates change but references produce.

Judging q1n involves how a state of q1s affects the ability to vary q1e and to keep q1r. If all goes well, you'll achieve q1o.
Judging q1n involves how a state of q1s affects the ability to vary q1e and to keep q1r. If all goes well, you'll achieve q1o.

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