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By Alistair Smout EDINBURGH (Reuters) - With less than a month to go until Scotland votes on independence, nationalists are seeking to broaden the debate away from a difficult focus on what currency would be used after breaking from the United Kingdom. Health care and other social issues such as justice and equality are likely to get a bigger airing if pro-independence First Minister Alex Salmond has his way in a second televised debate on Aug 25. The question of whether Scotland could keep the pound if it voted on Sept. 18 to leave the United Kingdom has hampered independence campaigners. The British government has said no and Bank of England Governor Mark Carney has warned of difficulties in monetary union.