49829
Paper folding theorem An upper bound and a close approximation of the actual paper width needed for alternate-direction folding is For single-direction folding ( using a long strip of paper ) , the exact required strip length L is where t represents the thickness of the material to be folded , W is the width of a square piece of paper , L is the length of a paper piece to be folded in only one direction and n represents the number of folds desired .
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Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities:  
Answer:
 None