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110 flights of stairs practice ✔ ️ 9 - 11 Memorial Stair Climb next for my Dad http://t.co/XbuOm7fP6N
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 None