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I'm pretty sure it's because not all mice have the buttons mapped in the same order, and if you're not using a proprietary driver, which in Linux you won't, obviously, then you have to remap the order of the keys.
Basically, it's saying:
set my button order like this = "click1 click2 click3..."
I had a 7-button mouse, and I had to map 6 and 7 to the 4 and 5 positions, because otherwise the mousewheel didn't work. It looks like 10 and 11 are mousewheel up and down.
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