In the provided lines from "A Sunset of the City" by Gwendolyn Brooks, the poetic elements mainly used are:
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caesura - The line breaks create a natural pause in the rhythm of the lines, suggesting a reflective quality.
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alliteration - The repetition of consonant sounds, such as in "Desert" and "dear," creates a musicality in the lines.
Therefore, the correct answers are caesura and alliteration.