UPDATE 1-Spain's Abengoa posts 1.2 bln euro net loss, debt rises
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MADRID, Feb 29 (Reuters) - Spain's Abengoa, on the brink of becoming the country's largest-ever bankruptcy, said on Monday its debt had risen by 492 million euros ($535.39 million) in 2015's fourth quarter as it posted a full-year net loss of 1.2 billion euros.