newtonian mechanics - Work done by action-reaction pair of tension

Work done by action-reaction pair of tension force on a system is zero if the string is inextensible I am trying to understand this statement taking the following arrangement in consideration. He

MCAT: Worked Problem for Newton's Third Law - Identifying Action-Reaction Force Pairs

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Where's the action force if the normal force is a reaction force?

newtonian mechanics - Work done by action-reaction pair of tension - Physics Stack Exchange

Work done by a pair of interacting forces.

newtonian mechanics - Tension and Newton's Third Law - Physics Stack Exchange

Trouble with the concept of tension.

homework and exercises - Spring in pulley system - Physics Stack Exchange

FBD Analysis of Two-Object System using Newton's Third Law Force Pair

Newton's 3rd Law-Action Reaction pairs-Inclined Plane

Can tension be regarded as an action force to the weight of the block hanging? - Quora

Action & Reaction Forces, Definition & Examples - Video & Lesson Transcript