Question: The 76ers–Celtics rivalry is a National Basketball Association (NBA) rivalry between the Philadelphia 76ers and the Boston Celtics, the two teams have the most meetings in which playoffs are a best-of-seven elimination tournament among 16 teams in the Eastern Conference and Western Conference (called divisions, pre-1970), ultimately deciding the league's season champion in the NBA Finals?
Sentence (from "76ers–Celtics rivalry"): The two teams have the most meetings in the NBA playoffs, playing each other in 19 series, with the Celtics winning 12 of them.
Relevant evidence: Yes