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These are models and , of course , all of these writers are writers who were active in the first half of the twentieth century .
 date: the first half of the twentieth century
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: date, organization, person, geographical social political, national religious political, facility, cardinal, location, work of art, law, event, product, ordinal, percent, time, quantity, money, language 
Text: {0} 
Answer:
 date: the first half of the twentieth century