14672
The Mark I was relatively expensive and time-consuming to manufacture , and reports from the field indicated that the knife 's large ' brass-knuckle ' fingerguard handle made it difficult to secure in conventional scabbards while limiting the range of useful fighting grip positions .
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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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