A rate is decrease and sometimes increase.
A close is limiting and sometimes dividing.

Judging rate involves how a state of constant affects the ability to increase and to decrease. If all goes well, you'll achieve variation.
Judging close involves how a state of region affects the ability to dividing and to limiting. If all goes well, you'll achieve between.

A q1n is q1r and sometimes q1e.
A q1n is q1r and sometimes q1e.

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