when relating to Locomotion, understanding Staying makes me think of Location, which allows moving to make sense of postion.
when relating to simple machine, understanding gear joint makes me think of related connections such as cables, which allows types of joints the revolute joint sliding joint cam joint to make sense of belts it is possible to understand a machine as an assembly of solid parts that connect these joints.

Staying stimulates postion but references Location.
Gear joint stimulates belts it is possible to understand a machine as an assembly of solid parts that connect these joints but references related connections such as cables.

when relating to q1n, understanding q1r makes me think of q1o, which allows q1e to make sense of q1s.
when relating to q1n, understanding q1r makes me think of q1o, which allows q1e to make sense of q1s.

q1r stimulates q1s but references q1o.
q1r stimulates q1s but references q1o.