Installing outlet in electrical box with two sets of wires? - Home

(apologies for possibly very newbie question) I found this setup in an electrical box in my downstairs closet underneath my stairs. It has two sets of wires that seems to be connected serially. My

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wiring diagram for multiple outlets together with two sources Home electrical wiring, Basic electrical wiring, Electrical wiring

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wiring - Can I run wires from two separate circuits through the same box? - Home Improvement Stack Exchange