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He also played Tests against Warwick Armstrong 's all-conquering Australian cricket team both home and away in 1920 - 21 and 1921 .
 person: Warwick Armstrong
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:
 person: Warwick Armstrong