51.   The stock characters simulate tribal antagonism, and the stunt drivers know their stuff.

52.   Then, make sure the referees know their stuff.

53.   The vice president knows this stuff.

54.   There were grown-ups like Chili Davis and David Cone, who have been around, who know some stuff.

55.   They know their stuff.

56.   They knew their stuff.

57.   This guy knows his stuff.

58.   This is not to say that Kapuscinski does not know his stuff in the way that academics and conscientious journalists do.

59.   This stuff is better known in geek-speak as spam.

60.   This Seattle outfit knows its stuff.