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The March on Washington for Jobs and Freedom and the conditions which brought it into being are credited with putting pressure on presidents John F. Kennedy and Lyndon B. Johnson .
 person: John F. Kennedy; person: Lyndon B. Johnson
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: John F. Kennedy; person: Lyndon B. Johnson