In his letter, Mr Moore calls for the immediate suspension of school performance tables, saying a "snapshot of school achievement" was damaging.

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For example, all Executive models are equipped with Adaptive air-suspension featuring Porsche Active Suspension Management (PASM), which combines superior performance and enhanced ride comfort.

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Still, for a high performance SUV like the Jeep Grand Cherokee SRT-8, the suspension does have to be stiffer than drivers of ordinary SUVs would probably like.

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Shares of Hutchinson Technology, a manufacturer of disk-drive suspension arms, are trading sharply higher after the company boosted its guidance on financial performance for the fiscal third quarter ending June 26.

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