How does the repetition used in "First They Came..." contribute to its overall meaning?

Throughout the poem, Niemöller uses repetition to describe the Nazis actions. Niemöller conveys this through the repetition of, “ First they came for the Communists” and then proceeds to repeat that phrases with different minority groups until it reaches him.

Explanation:

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i believe the answer is thesis, reasons, evidence, counterclaim, conclusion