In this poem the repetition of 'and' is used to add emphasis using the figurative language juxta position, to show the significance of the event.
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Answer: A plateau period is when you are in a place where nothing hasn’t moved concerning a situation.
Explanation: For example, someone can have a plateau in weight, where the scale isn’t moving up or down it’s just staying the same.
What’s the full context? What passage are you referring to?
