The binary plan is a network marketing compensation plan wherein new distributors are placed in a binary (two legged) tree structure, or a left and a right sub-tree in the organization.
http://www.network-marketing-made-easy.com/binary-plan.html

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Binary Tree (Placement Tree) — The organizational
structure with two legs of sponsorship often
referred to as the Left Leg and the Right Leg.

Leg — In the Binary Tree, there are only two legs
of sponsorship permitted per distributorship–often
referred to as the Left Leg and the Right Leg. Every
distributor you personally sponsor and the people
they sponsor, and so on, are placed in either the Left
or Right Legs.

https://www.syntekoffice.com/syntek/Media/PDF/le-agreement/U...

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The requirement for earning binary commissions is that you must have
personally sponsored two IBOs that are currently active with 40 PCV, one
placed in your left leg and one in your right leg. As you add personally
sponsored reps below you, and those reps add IBOs underneath
themselves, you will experience growth in each of the “legs” beneath you

http://teamtlcmarketing.com/downloads/TLC_COMP.pdf

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poddrzewo
https://upload.wikimedia.org/wikipedia/commons/7/7e/Treedata...