I get error for using "!" after using "=>"


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I tried to check if teleported_players does not contain player but got an error with my approach

I understand that the error appears because this language probably have a unique way of doing it. i would appreciate any replies. I’m new to coding.

I would like to know if there is a way to express logical negation in verse

Usually you would use a for expression to filter through results like that. This video shows that toward the end.

For Expression

Not Operator