31.   He knows this stuff.

32.   He is the man everyone in the clubhouse knows knows his stuff.

33.   He knew our stuff, but had never played it.

34.   Hooverson knows his stuff.

35.   How were they supposed to know that stuff?

36.   If you guessed Karnaugh, you must really know your stuff, because the honor should have gone to the third-place finisher.

37.   In fact, Brothers answered six hours of questions about the fight game in front of the grand jury just to prove that she really knew her stuff.

38.   It is, after all, my job to know stupid stuff like this.

39.   Most of the audience knows this stuff.

40.   No doubt Grigsby knows his stuff.