1.   An unknown number of people died or were wounded in clashes with troops.

2.   An unknown number of vaquita, probably in the hundreds, had already been lost.

3.   On the other hand, an unknown number of heterosexuals do.

4.   One teen-ager was reported killed, and an unknown number injured.

5.   An unknown number of demonstrators were arrested.

6.   An unknown number of cases go unreported.

7.   Hundreds of people were illegally executed in Indonesia and Myanma, and Thai security forces committed gross human rights violations, killing an unknown number of pro-democracy demonstrators.

8.   It is most useful where records are to be sampled by computer from an unknown number held on, say, a magnetic tape.

9.   An unknown number died waiting.