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The  28th Infantry Division  ( Keystone ) is a unit of the  Army National Guard  and is the oldest division-sized unit in the armed forces of the United States .
 subsidiaries: 28th Infantry Division, Army National Guard
Given options, please tell me the relationships of all the listed entity pairs.Output format is "relation1: word1, word2; relation2: word3, word4". 
Option: cities of residence, top members employees, members, alternate names, origin, state or provinces of residence, title of person, spouse, city of headquarters, NA, founded by, state or province of headquarters, employee of, countries of residence, country of birth, founded, subsidiaries, country of headquarters 
Text: {0} 
 Entity Pairs:  28th Infantry Division, Army National Guard 
Answer:
 subsidiaries: 28th Infantry Division, Army National Guard