Question: in the 1979–80 NBA season, Philadelphia 76ers acquired a guard from the Portland Trail Blazers who has recently served as a head coach of which NBA team ?
Sentence (from "1979–80 Philadelphia 76ers season"): The series was memorable for Julius Erving's baseline move in Game 4, and Magic Johnson's 42-point effort in Game 6 starting the game at center in place of an injured Kareem Abdul-Jabbar.
Relevant evidence: No