NFL preseason

With the AFL--NFL merger of 1970, the newly merged NFL was granted a Sherman Anti-Trust Act exemption, which emboldened some team owners to expand the exhibition schedule and to require season-ticket holders to pay for one, then two, then three home exhibition games if they wanted to keep their season tickets. The exhibition season then became, and remains, a large source of owner revenue that is not shared with the players. From 1970 through 1977, the NFL season consisted of 14 regular season games and six exhibition games, sometimes but not always three at home and three away (the 1973 Washington Redskins, for instance, played all but one of six preseason games at home), with some played at neutral sites. Since 1978, the regular season is 16 games, and the exhibition season was cut from six to four games. Two teams play five exhibition games, however.

Question: did the nfl ever play 6 preseason games
Answer: yes