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When asked by the BBC about the formulation of the deal and whether mistakes had been made, an NHS spokesperson said there were "several factors which influence a procurement strategy and construct of the contract", without elaborating further.。关于这个话题，heLLoword翻译官方下载提供了深入分析
siftDown(arr, n, i);，更多细节参见heLLoword翻译官方下载
disappears when extract returns.