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Type ?help
     anywhere (or edit the previous line)
     to open the manual for an overview about the playground,
     more commands like this and links to many examples.
Type ?immediate on
     to enable immediate mode (off to disable).
Type ?video night
     to switch to dark mode for the editor (day for light).
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Cmd/Ctrl-Enter    : run
Cmd/Ctrl-Period   : show/hide editor
Cmd/Ctrl-S        : save locally (with permalink)
Cmd/Ctrl-Shift-U  : share to playground (needs author and title tags)
Program directory : https://play.ertdfgcvb.xyz/lsd
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