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Is it all interior run between the two panels? Even if it is, run it through conduit. Use flex if inside to inside, use rigid if it goes through the exterior. Don't use the ext. cord because it wouldn't past code out here.
Run wires (not Romex or extension cord) in the conduit for much needed or better protection. Like Dad911 said, make sure there is no bond or connection between the grounding and the neutral buzz bar in the sub panel.
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