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With the drafting machine one can perform a series of drawing operations that otherwise could only be achieved with a much more complex use of the classic ruler square and protractor , as , for example , drawing parallel lines , orthogonal lines , inclined lines according to a preset angle , measurement of angle s , etc. .
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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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