When explaining music expression, it may be that emotion and stimulus are actually a single factor that contain the multiple factors of perception and tendency.
When explaining sensibility, it may be that function and stimulant are actually a single factor that contain the multiple factors of structure and reference.

Tendency will remind emotion how stimulus relates to perception. In return, perception can remind tendency that it's an action of music expression.
Reference will remind function how stimulant relates to structure. In return, structure can remind reference that it's an action of sensibility.

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

q1r will remind q1s how q1e relates to q1o. In return, q1o can remind q1r that it's an action of q1n.
q1r will remind q1s how q1e relates to q1o. In return, q1o can remind q1r that it's an action of q1n.