"Собой" is not required. It's optional provided that it is correct. I think we only can use "собой" if "покрывает" means that something lays on something else and covers it. In the example sentence...
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"Собой" is not required. It's optional provided that it is correct. I think we only can use "собой" if "покрывает" means that something lays on something else and covers it. In the example sentence...
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