The sentence has been rewritten in correct parallelism below:
Parallelism is a style of writing in which words follow a particular pattern that lends rhythm and balance to the text. The way in which certain parts of the text are constructed is similar.
In the above sentence, the addition of the phrase, 'should be,' altered the correct pattern that the sentence had at the outset.
To balance the pattern and rhythm of the sentence, the past participles of the verbs should be maintained. Thus, the revised sentence is the above in bullet point.
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