Why are Certain lines repeated on sixteen steps tp the ice house?

Repetition of certain lines throughout the poem "Sixteen Tons" by Tennessee Williams reflects the cyclical nature of the speaker's laborious and monotonous work at the ice house. The repetition reinforces the sense of routine, oppression, and the speaker's resigned acceptance of his difficult circumstances. By emphasizing these lines, Williams creates a powerful and haunting effect that underscores the harsh realities of the speaker's life.