11.   Both Kittel and other federal officials emphasized that it is not a certainty that the traces were left during the dog training.

12.   A typical example was the kidnapping of an executive, leaving no trace except for his bloodstained car.

13.   But engineers at the board say that they have no physical evidence for this and may never, because such sparks would leave little trace.

14.   But his film leaves no trace.

15.   But the virus also vanished within days of causing infection, often leaving no trace as the delicate strands of its RNA simply disintegrated in the body.

16.   Come Monday, they were all but extinct, leaving only traces of their existence.

17.   Everything leaves its trace.

18.   Fugitive slaves left few traces for fear of jeopardizing other escapees.

19.   He was also shrewd enough, they asserted, to leave few traces that would attract the attention of the International War Crimes Tribunal in the Hague, Netherlands.

20.   His voice is smart, not noisy, almost silent, barely leaving a trace.