When an author mentions or describes some special thing more than once, it implies that that 'thing' symbolizes something else, probably an abstract quality keyed with the written work's theme.

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Read the sentence from last lecture by randy pausch. all right, so what we’re not talking about today, we are not talking about cancer, because i spent a lot of time talking about that and i’m really not interested. pausch tells his audience this because he wants them to know that