This is the one I'm looking for. Plug ports have two kinds of directions. No matter what plug you have, you can find it without blocking other ports. You know that in different devices, some have built-in converter at the connector place, but with different directions, then there may be multiple expansion ports blocked, for example, you have 10 ports, but only 3 devices can use it because 7 ports are blocked . Now this solved my problem.
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