11.   The whistles are a code sent to the dogs.

12.   The whistles were silent.

13.   There are fewer whistles.

14.   There are no whistles, but the action stops when the kid speaks.

15.   There had indeed been a whistle, referee Gary Lane later explained, blowing the play dead because of extra stuff on the field.

16.   There is contact, maybe one guy knocks the other down, and there is no whistle.

17.   They touched the puck, but did not control it, so there was no whistle from the referee Dan Marouelli.

18.   Train whistles are almost painfully loud.

19.   The whistle was a warning that city inspectors were en route and the toreros were taking no chances.

20.   Whistles are traditional tools of German feminists for fending off threatening men.