| 21. | Tracers came at us from the range across the valley.
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| 22. | The Swiss government has required such tracer particles for a dozen years.
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| 23. | Mercury Tracers sold in the U . S aren't affected.
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| 24. | Mercury is taking a different approach to selling the Tracer.
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| 25. | Indeed, the redesigned Tracer and Escort look like other small sedans.
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| 26. | Earlier researchers had used substances like iodine and phosphorus as radioactive tracers.
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| 27. | Luckily, the player has a CyberMerc named Tracer as an ally.
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| 28. | Tracer sends clues occasionally about where the Judas will strike.
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| 29. | The gun-explosives lobby has said little about the molecular tracers.
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| 30. | PET relies on chemical tracers injected into patients to track body processes.
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