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The attack forces then retreated over land through Loc Binh , where other French units had been dropped on July 17 to repair and hold a river crossing for the retreating units ; and then to form a rearguard for 20 miles .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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