Just for fun...

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I don't know what USBs fit what, and which way they go? Designers like the look of black on black. Directionally and type color code them! Put the blue in the blue and the yellow up in the yellow. Now, it always takes five tries. With two or three types. Up needs to be marked. Type needs to be distinguished with a color flag. Use arrows for linkage with paint, up to up, yellow to yellow. Blue up to blue up of the same species. Incompatible species are different colors. And will not show up to up.
 
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