51.   What pollsters say Russians clearly want is Putin, although his intentions remain, so far, largely a blank slate.

52.   When he arrives, he will be working essentially with a blank slate.

53.   With the educational marketplace jammed with competing designs, the charter school has become the blank slate on which absolutely everything can be drawn and tested.

54.   You see, Adam is a cross between a chameleon and a blank slate, able to be all things to all people.

55.   Perks, meanwhile, is coming in with a blank slate, no preconceived ideas.

56.   But even in his lifetime, the blank slate of reputation was endlessly filled, erased and filled again.

57.   Commencements are one of the few times of year when a president has plenty of notice and a blank slate for a speech topic.

58.   Embryonic cell lines, each deriving from a single embryo, have the ability to divide into an infinite number of biological blank slates.