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He was obliged to find the briefcase just because of the important documents in it. |
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The briefcase he'd lost contained such important documents that he had no choice but to find it. |
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The briefcase in which he kept his very important documents was lost,' leaving him no choice but to find it. |
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He had no alternative except find the briefcase, there being such important documents in it. |
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The documents in the briefcase which he'd lost were so important that he had to find them at all costs. |