He said he had discussed the issue with the prime minister in July and while they had "agreed to disagree" on it, but Mr Cameron had also promised to answer in writing.

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They are instructed to read them, practise writing them in their workbooks, and answer questions.

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We have sent him questions about this, in writing, but he has declined to answer.

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The answer: by solving the vulnerability problem before it happens, in the writing of the program itself.

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