Hyper+Shift+q is ghosted key
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Discovered a dead key. In emacs, i have the Menu key set as Hyper, and i have “Hyper+Shift+q” as a shortcut to some command. However, Microsoft ergonomic 4000 keyboard simply does not register that combination when right shift is used. But left shift works. See also: Keyboard Ghosting; How Many Keys Your Keyboard Can Take?.