Definition: You are given the conttent of a table in the input (row by row). Generate an unambiguous question based on the information present in the table, such that: 1) It's answer is unique and is in the given table, 2) Its answer is a contiguous text span from the table. Avoid creating questions that can be answered correctly without reading/understanding the table
Input: Table: ['Date', 'Team', 'Name', 'Position', 'Years in NBA', 'Notes']. ['April 23, 2009', 'Houston Rockets', 'Dikembe Mutombo', 'C', '18', 'Suffered a season-ending injury']. ['May 21, 2009', 'Free agent', 'Sam Cassell', 'G', '15', 'Became an assistant coach of the Wizards']. ['September 3, 2009', 'Free agent', 'Bruce Bowen', 'F', '12', '']. ['October 22, 2009', 'Free agent', 'Mark Madsen', 'F', '9', 'Became an assistant coach of the Utah Flash (D-League)']. ['October 23, 2009', 'Free agent', 'Bobby Jackson', 'G', '12', '']. ['October 23, 2009', 'Free agent', 'Tyronn Lue', 'G', '11', 'Became the director of basketball development of the Celtics']. ['November 5, 2009', 'Free agent', 'Darrick Martin', 'G', '14', 'Named assistant director of player development of Timberwolves']
Output:
who played for at least 15 years in the nba?