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A young writer has just managed to publish his first book. He is very proud of his success and is boasting of it to everybody around. For more than half an hour he has been talking about his success to one of his friends who is also a writer. At last he thinks that his friend is not very much interested and apologizes saying "I am sorry to have taken so much of your time, it is so selfish of me." — "Never mind," answered his friend absent-mindedly. "You haven't taken my time at all. I've been thinking over the plot of my new novel."
Why wasn't his friend annoyed?