It is a very simple script that does what it is supposed to do
Why 3 stars?

- The variables are not listed instead of {canopself.%player's uuid%} → {opSelf::%player's uuid%}

- Instead of giving a specific variable to each player, it would be better to add them to the list. This is so admins know who is and who isn't OP

Nice implementation! 5 Stars from me!
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Simple and easy to use. Would be nice if there was a command with which you can remove someone's permission to use the selfop command