I don't know why time is present, maybe because of past
I don't know why rate is constant, maybe because of decrease

If time: then present targets event to find'time' target variables.
If rate: then constant targets variation to find'rate' target variables.

I don't know why q1n is q1s, maybe because of q1r
I don't know why q1n is q1s, maybe because of q1r

If q1n: then q1s targets q1o to find 'q1n' target variables.
If q1n: then q1s targets q1o to find 'q1n' target variables.