1.   It is not unknown for valuable display items to go, ahem, missing.

2.   The effect of the new policy will be unknown for the immediate future.

3.   It is not unknown for a salesman to describe the product in glowing terms and you would expect him to highlight the best features.

4.   But the long-term impact of the continuing worldwide attention on Selena is still unknown for Tejano artists.

5.   It is not unknown for a sea voyage to prompt an epiphany, perhaps a religious manifestation, a scientific brainstorm, an introspective discovery.

6.   It is not unknown for a new bidder to appear this late.

7.   It proved to be whereabouts unknown for Carl Lewis at Olympic Stadium on Saturday night.

8.   It was not unknown for his monologues to well exceed the listening patience of his friends.

9.   It is almost unknown for two democratic countries to wage war.

10.   It is not unknown for sought-after newsmakers to bump a news show or two from their itineraries.