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Available at: <https://www.washingtonpost.com/energyenvironment/2018/12/11/arctic-is-even-worse-shape-thanyou-realize/?noredirect=on&utm_term=.508085a17318>. Retrieved on: July 2, 2019. Adapted.
In the fragment “Young and thin ice can regrow relatively
quickly once the dark and cold winter sets in.” (lines 55-57),
sets in can be replaced, without change in meaning, by