* Spain aims to sell 3.5-4.5 bln euros in two bonds * Yield on 10-year bond to fall, but hold at high levels * Treasury will also sell a new three-year bond * Analyst says Spain's fiscal credibility would be better under rescue package By Nigel Davies MADRID, Sept 20 (Reuters) - Spain's 10-year borrowing costs are likely to fall sharply at an auction on Thursday compared with a month ago but remain uncomfortably high as Prime Minister Mariano Rajoy holds back from requesting a rescue that many regard as inevitable. Just two days after selling 4.6 billion euros...
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