4576
Maj. Gen.  Joseph Hooker  who became commander of the  Army of the Potomac  in January 1863 ordered his deputy provost marshal Col. George H. Sharpe to create a unit to gather intelligence .
 Joseph Hooker, Army of the Potomac
Please list all entity pairs containing a certain relationship in the given options.Output format is "word1, word2; 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} 
Answer:
 Joseph Hooker, Army of the Potomac