Two 10 × 11 cm cards — editing shortcuts for either 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.
Modifiers:⌘ Command · ⌥ Option · ⇧ Shift · ⏎ Return. macOS defaults; single letters are Timeline tools/commands.
Preview below is shown enlarged; it prints at real size (10 × 11 cm each).