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    For other people who are wondering: C-b M-2 means Control-b, and M-2 means alt+2. Commented Jun 21, 2014 at 20:49
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    M-2 means ESC+2 for me on Debian using Gnome Terminal. Probably depends on setup. Commented Nov 24, 2014 at 5:06
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    C-... and M-... are emacs-ims M- means "meta" which is [Alt] in combination with or [Esc] followed by the referenced key both options look the same over the wire, but there is the possibility that your GUI may be trapping the [Alt] sequence Commented Jul 17, 2015 at 3:56
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    Just to put this here in case it helps someone else, because I am constantly confused, "vertical" and "horizontal" are the direction of the spacing--that is, choosing even-vertical will create a layout where the three panes are stacked vertically, equal in height, where even-horizontal will create a layout where the three panes are side-by-side, equal in width Commented Mar 22, 2016 at 16:20
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    How to do M-2 on macOS with a keyboard where "2" requires pressing shift (like the French keyboard)? I didn't succeed, with various combinations of alt, control, command, escape and shift + 2… Commented Apr 7, 2018 at 9:05