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“Currently” (line 29) can, without changing its meaning, be replaced for Heretofore.
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The word “catastrophe”, in “after the Chernobyl catastrophe” (line 22), can, without changing its meaning, be replaced by meltdown.
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The word “resettled”, in “350,000 people had to be resettled” (line 18), can, without changing its meaning, be replaced for reoriented.
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The word “illnesses” (line 16) can, without changing its meaning, be replaced by diseases.
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The words “factors” (line 38) and reasons are synonyms.