How many vertices in the graph below have even valences? 
Definitions:
Employment
The condition of having paid work, encompassing various aspects from job application to hiring, work conditions, and termination.
Polygraph Tests
A type of lie detector test used in certain contexts to assess the truthfulness of individuals by measuring physiological responses to questions.
Screen Applicants
The process of reviewing job candidates' resumes and qualifications to determine their suitability for a position.
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