| 21. | But tests on hundreds of food samples have yet to turn up the specific cause.
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| 22. | But a specific cause is identified in less than half the cases, the study noted.
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| 23. | A specific cause of death was not immediately given.
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| 24. | In signing a certificate, a doctor is supposed to list a specific cause of death.
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| 25. | Authorities investigating the Sept . 21 explosion haven't given a specific cause for the blast.
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| 26. | In most cases, no specific cause can be identified.
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| 27. | The report did not give a specific cause of death for three of the victims.
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| 28. | Every year, a special topic is chosen and funds collected donated to that specific cause.
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| 29. | Many historians, however, feel that one specific cause cannot be selected for this large phenomenon.
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| 30. | The specific cause of Pineda's muscle weakness remains undefined.
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