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Additionally , their ability to use chemical and biological weapons , they ' ve proven it historically .
 person: their; person: they; weapon: chemical; weapon: chemical and biological weapons; weapon: biological
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: organization, person, geographical social political, vehicle, location, weapon, facility 
Text: {0} 
Answer:
 person: their; person: they; weapon: chemical; weapon: chemical and biological weapons; weapon: biological