Consider the following tree diagram: 
Which of the following nodes are parent nodes?
Definitions:
Division of Labor
The assignment of different parts of a manufacturing process or task to different people in order to improve efficiency and productivity.
Marriage Contract
A legal document that outlines the rights and obligations of each partner entering into marriage.
Economic Division
The separation of economic activities, resources, or groups within a society or economy, often leading to disparities in wealth and opportunity.
Social Justice
The pursuit of fairness and equity within society through the establishment of policies, practices, and laws that address inequality and discrimination.
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