They believe millions of them are passing through us every second without a trace.
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Their owners are keen to trace them and are focusing the search near Cardiff airport after sightings.
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Many Israelis trace their roots back to Arabic-speaking countries, and this fusion is reflected in their creative cuisine.
Drug companies want to trace those lines to genes underlying disease, and they will for a price.
North Yorkshire Police are currently appealing for help to trace a laptop belonging to Ms Davison.
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Countless genres are chemically fused, making it difficult to trace which ideas came from where.
He is now hoping to trace the enigmatic couple but is not holding out much hope.
The man has been identified by police, however officers are trying to trace his family.
The appeal to trace the vehicle was broadcast on the BBC One's Crimewatch programme earlier.
Police were able to trace the ticket, which was confirmed to have been issued to Kelly.
The RSPCA wants to trace the pony's owner to hear their version of events.
It can be difficult to link all these addresses and trace them back to the origin.
Detectives have been reviewing CCTV footage of the area in an attempt to trace her movements.
Above all, the best trace is found on the monopolist by reading the commitments they gave.
The Italian foreign ministry has activated its crisis unit to try to trace Mr Quirico.
Geography is a mostly fixed lens, a constant that lets you trace seamless stories across time.
Okpako traveled with Auma Obama to many significant places in her life to trace her story.
The second woman the Met is trying to trace is a Colombian, named Maria.
An international effort mapped out thousands of physical traits and genetic clues to trace the lineage.
But he added there was "no proof, no trace" of the alleged secret payments.
Fifty thousand years ago, a meteor carrying trace amounts of silicone carbide crashed into present-day Arizona.
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Because it's so hard to trace the attack to a perpetrator, direct retaliation may be impossible.
Trace-A-Face or You Draw, challenges the player to draw a new subject every day.
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On the other, subtract even a trace core ingredient, and you can demolish the identity.
Samples of the oil have also been sent for testing to try and trace its source.
Outfitters throughout eastern Kentucky, such as Sheltowee Trace Outfitters, provide gear and boat rental.
In Bristol the company can trace its routes back centuries to Royal Fire Insurance.
The gaily plumed horses in the different rings trace divergent patterns at variant speeds and impulsions.
Mitochondrial DNA passes unchanged from mother to child, making it useful to trace maternal lineage.
However, carbon-14 is only found in trace amounts, which can make it difficult to detect.
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