LONDON, Sept 4 (Reuters) - European shares were set for a steady open on Tuesday, with investors seen avoiding strong bets before Thursday's European Central Bank meeting, which is likely to provide details of a debt-buying scheme to help stressed countries in the region. The FTSEurofirst 300 index has gained in the previous two sessions and analysts said investors were largely positioned for a positive response from the ECB, but continued uncertainty over the scale and nature of the central

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