You do need to tell them what you have been doing for the past two years and why. It is unique circumstances and you certainly have not sat around and done nothing. I would rather that you not write about this in one of the essays. I would recommend writing about this either in the additional information essay (which is usually no more than a paragraph) or write admissions an email and tell them of your circumstances this way. Admissions essay space is so limited that I would prefer that you use it for the appropriate purposes.
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