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Conditions (start (%variable=null (Check var exists (??variable (It's…

- - - - ??variable
        
        It's set, say /start
      - else
        
        variable is not set
        
        Set true or false
        
        //true
        
        %variable=true
        
        check
        
        Check variable?
        
        //please
        
        3 more items...
        
        //false
        
        %variable=false #