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becomes became has become had become
permanent powerful striking practical
the past 30 million the past 40 million the past 50 million the past 10 million
witnessed witnesses has witnessed will witness
becomes became has become had become
permanent powerful striking practical
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They may have been caused by the damage to the radio systems. They may have taken place during take - off and landing. They were proved to have been caused by the passengers' portable computers. They were suspected to have resulted from electromagnetic interference.
permanent powerful striking practical
A. to plant to planting plant planting
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