I bought a simple SD card breakout board for a project, and it has a double row of pin headers, with each I/O having two pins (the I/O are GND, +5V, +3V, MISO, MOSI, SCK and CS). I hadn't seen this before and it got me thinking about why you would do this. The only reason I could come up with is if you wanted to chain multiple boards together, but that wouldn't make alot of sense in this case.
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