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How has the EU reacted to Cameron's reform demands?

Prime Minister David Cameron has published a letter outlining his four main issues for reforming the UK's membership of the EU.

The list of goals - the single market, sovereignty, competitiveness and immigration - was branded a gimmick by some Conservative colleagues.

The European Commission claimed some parts were "highly problematic".

So how have EU member states reacted to the demands?

Europe editor Katya Adler reports.