''Atticus said to Jem one day, "I’d rather you shot at tin cans in the backyard, but I know you’ll go after birds. Shoot all the blue jays you want, if you can hit ‘em, but remember it’s a sin to kill a mockingbird."' In this sentence, which modal verb is used by Atticus to give a recommendation to Jem and what does it indicate?

(‘To Kill a Mockingbird' by Harper Lee)

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