Question: The 1990–91 NBA season was the Rockets' 24th season in the National Basketball Association, and 20th season in the city of Houston, the Rockets continued to play .500 basketball during the first half of the season as which Nigerian-American former professional basketball player, formerly known as Akeem Olajuwon?
Sentence (from "1995–96 Houston Rockets season"): Midway through the season, the team signed free agent Sam Mack, who previously played in the Continental Basketball Association.
Relevant evidence: No