11.   But despite scores of fawning profiles and obsequious reviews of his ghost-written autobiography, Powell remains little more than a blank political slate.

12.   But her angular blank slate of a face, with its probing, blue-eyed stare, made her unmistakable.

13.   But if there were few blank slates about the Simpson case in the jury pool or anywhere else, the self-portraits in the questionnaires contained almost no chalk marks.

14.   But is a blank slate really the look we want as we age?

15.   But he is something of a blank slate in national politics, and his selection does not signal any ideological shift.

16.   Congress is starting with a blank slate, or close to it.

17.   Embryonic stem cells are like blank slates that can become any tissue in the human body.

18.   His past homes had been blank slates on which he imposed his personality, as he had on canvas or videotape.

19.   Human beings may not be blank slates, but neither is there evidence that the chromosomes contain the legendary handwriting on the wall.

20.   If her political record is a blank slate, her record of public service is ample, but mixed.