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I have a Lenovo Thinkpad x200s. how do I unmap the forward and backward keys?

I want something like..

xmodmap -e 'keycode 166=NOOP'

Or some way to ignore the XF86Back keysym.

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Damn, I was close...

xmodmap -e 'keycode 166='
xmodmap -e 'keycode 167='
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