Parallel structures are the repetitive use of grammatical phrases with the same meaning. The sentence using the words activist, political president, and philanthropist shows parallelism.
The parallel structure of parallelism is the balance of the grammatical elements like the phrases and words that display that they are of equal importance as the other words in the sentence.
The description of Mandela's professions like being an activist, political leader, and philanthropist shows that all of his positions are of equal importance.
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