Пример #1
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 public void RemovePresent(Present present)
 {
     _contents.Remove(present);
 }
Пример #2
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 public void DeliverPresent(Present present)
 {
     present.Delivered = true;
     RemovePresent(present);
 }
Пример #3
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 public void AddPresent(Present present)
 {
     _contents.Add(present);
 }