How to locate inputs for the endpoint "Find Custom Headcount"?

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Where they live

Example: Washington, United States ⇒ 103977389

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Where they studied

Example: StandFord University ⇒ 1972

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What they do

Example: Sales ⇒ 25

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What they are skilled at

Example: Java ⇒ 147

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What they studied

Example: Computer Engineering ⇒ 100347