Leaders are not allowed to attend festivals. Also, they are not allowed to use office cars, except for performing assigned tasks

Leaders are not allowed to attend festivals until they use office cars for performing assigned tasks.

Leaders are not allowed to both attend festivals and use office cars, except for performing assigned tasks.

Leaders are allowed to either attend festivals or use office cars, except for performing assigned tasks.

Leaders are allowed to neither attend festivals nor use office cars, except for performing assigned tasks.