21.   Not that it matters, mind you.

22.   Not that it really mattered.

23.   Not that it really matters anymore.

24.   Not that it really matters, because this train is much too far down the track to change course, even if anyone wanted.

25.   Not that it really matters.

26.   Not that it will matter, except to us.

27.   Not that it would matter.

28.   Not that it mattered a bit to the youthful, enthusiastic audience that filled the venue.

29.   Not that it mattered to some.

30.   Not that it matters to him.