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Parallel, as used in line 22, means "occurring or existing at the same time; corresponding or similar."
I figured out the proper meaning by considering the context in which the word is used in the sentence. The phrase "one right after the other" suggests a consecutive or simultaneous occurrence, indicating that the two incidents (or choices) are happening at the same time or are similar in nature. Therefore, the definition that best fits the meaning in this context is "occurring or existing at the same time; corresponding or similar."