Information:  - Pittsburgh is a city in the Commonwealth of Pennsylvania in the United States, and is the county seat of Allegheny County. The Combined Statistical Area (CSA) population of 2,659,937 is the largest in both the Ohio Valley and Appalachia, the second-largest in Pennsylvania after Philadelphia and the 20th-largest in the U.S. Located at the confluence of the Allegheny and Monongahela rivers, which form the Ohio River, Pittsburgh is known as both "the Steel City" for its more than 300 steel-related businesses, and as the "City of Bridges" for its 446 bridges. The city features 30 skyscrapers, two inclines, a pre-revolutionary fortification and the Point State Park at the confluence of the rivers. The city developed as a vital link of the Atlantic coast and Midwest. The mineral-rich Allegheny Mountains made the area coveted by the French and British empires, Virginia, Whiskey Rebels, and Civil War raiders.  - Theodore `` Tiger '' Flowers ( August 5 , 1895 -- November 16 , 1927 ) was the first African - American middleweight boxing champion , defeating Harry Greb to claim the title in 1926 . Nicknamed the `` Georgia Deacon '' , he was a devoutly religious man who would recite a passage from Psalm 144 before every bout . The International Boxing Research Organization rated Flowers as the # 12 ranked middleweight of all - time , while boxing historian Bert Sugar placed him 68th in his Top 100 Fighters catalog . The Bleacher Report named him the # 6 greatest southpaw in boxing history . He was inducted into the Ring Magazine Hall of Fame in 1971 , the Georgia Sports Hall of Fame in 1976 , the World Boxing Hall of Fame in 1990 , and the International Boxing Hall of Fame in 1993 .  - Boxing is a combat sport in which two people wearing protective gloves throw punches at each other for a predetermined set of time in a boxing ring.  - Bert Randolph Sugar (June 7, 1936  March 25, 2012) was a boxing writer and sports historian recognizable by his trademark fedora and cigar.  - Edward Henry "Harry" Greb (June 6, 1894  October 22, 1926) was an American professional boxer. Nicknamed "The Pittsburgh Windmill", he was the American light heavyweight champion from 1922 to 1923 and world middleweight champion from 1923 to 1926. He fought a recorded 298 times in his 13 year-career, which began at around 140 pounds. He fought against the best opposition the talent-rich 1910s and 20s could provide him, frequently squaring off against light heavyweights and even heavyweights. Widely considered one of the best fighters of all time, Greb was named the 7th greatest fighter of the past 80 years by the "Ring Magazine", the 5th greatest fighter of all-time by historian Bert Sugar and ranked as the #1 middleweight and the #2 pound-for-pound fighter of all-time by the International Boxing Research Organization. Statistical boxing website BoxRec lists Greb as the #3 ranked middleweight of all-time and the 8th greatest pound-for-pound fighter ever.  - Heavyweight is a weight class in combat sports. Boxing. Boxers who weigh over 200 pounds (14 st 3 lb, 90 kg) are considered heavyweights by the major professional boxing organizations: the International Boxing Federation, the World Boxing Association, the World Boxing Council, and the World Boxing Organization.    Given the information, choose the subject and object entities that have the relation of 'occupation'.
The answer to this question is:
tiger flowers , boxer