In the diagram,what represents a pivot joint? 
Definitions:
Sample Space
The set of all possible outcomes or results in an experiment or a random trial.
Experimental Outcomes
The possible results that can occur from a planned experimental procedure, each outcome being a unique result of the experiment.
Tree Diagram
A graphical representation that helps in visualizing a multiple-step experiment.
Permutations
Arrangements of a set of objects in which the order of the objects matters.
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