Two 10 × 11 cm cards — one for each side of a 15″ MacBook trackpad.
Print & cut
Print on A4, landscape. In the print dialog set Scale = 100% (not “Fit to page”) and turn Margins → None/Default — this keeps the cards at exactly 10 × 11 cm.
Cut along the dashed borders.
Slide card 1 under the keyboard on the left of the trackpad, card 2 on the right.
Prefix key is Ctrl-b (shown as ⌃b). A key like c means: press Ctrl-b, release, then c.
Preview below is shown enlarged; it prints at real size (10 × 11 cm each).
tmux 1
prefix ⌃b
Shell — run from your terminal
tmuxstart server + sessiontmux new -s xnew named session xtmux lslist sessionstmux aattach to last sessiontmux a -t xattach to session xtmux kill-ses -t xkill session xtmux kill-serverkill everything