As an HR coordinator, you are tasked with creating a mapping relation that assigns the names of team members to their respective hiring dates. While organizing the data, you notice that several employees share the exact same hiring date. Based on the mathematical rules for determining the range from a mapping, how must these shared dates be recorded in the final set?

A Human Resources manager is organizing a company-wide 'Birthday Spotlight' program. To visualize the data, the manager creates a mapping diagram where arrows connect each employee's name to their specific birthday. Match each mathematical term to the part of the HR manager's data organization system that it describes.

A Human Resources assistant is reviewing a mapping diagram that connects each employee's name to their birth month. If four different employees were all born in June, the month 'June' should be listed four times when writing out the set for the range.

An office manager uses a mapping diagram to link each employee's name to their specific birthday for a company calendar. In this mathematical relation, the set of all the employee names (the $x$-values) is called the ____.

HR Data Mapping: Workshop Range