Exemplo n.º 1
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 public bool RemoveCoupon(string couponCode)
 => Discount.TryGetCoupon(couponCode, out Discount d) && RemoveCoupon(d);
Exemplo n.º 2
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 public bool AddCoupon(string couponCode)
 => Discount.TryGetCoupon(couponCode, out Discount d) && AddCoupon(d);