* Spain sells 4.58 billion euros of 12-, 18-month bills * Yields on both fall versus August auction * Spain government stalls on asking for aid By Paul Day MADRID, Sept 18 (Reuters) - Spain easily sold 4.6 billion euros ($6 billion) of short-term debt on Tuesday but uncertainty over whether the country will apply for an aid programme and trigger a European Central Bank bond-buying programme kept yields at a high level. The Spanish Treasury,...
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