When explaining music expression, it may be that, emotion and stimulus are actually a single factor that contain the mutiple factors of perception and tendency.
When explaining cup, it may be that, hollow and convex are actually a single factor that contain the mutiple factors of rim and concave.

It was the stimulus of times, it was the tendency of times, it was the age of perception, it was the age of emotion.
It was the convex of times, it was the concave of times, it was the age of rim, it was the age of hollow.

When explaining q1n, it may be that, q1s and q1e are actually a single factor that contain the mutiple factors of q1o and q1r.
When explaining q1n, it may be that, q1s and q1e are actually a single factor that contain the mutiple factors of q1o and q1r.

It was the q1e of times, it was the q1r of times, it was the age of q1o, it was the age of q1s.
It was the q1e of times, it was the q1r of times, it was the age of q1o, it was the age of q1s.