189512
More precisely , if K is a smooth knot , then for almost every unit vector v giving the direction , orthogonal projection onto the plane perpendicular to v gives a knot diagram , and we can compute the crossing number , denoted n ( v ) .
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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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