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By James Mackenzie ROME (Reuters) - Italy's Prime Minister Enrico Letta won a confidence vote in parliament's lower chamber on Wednesday after urging lawmakers to back his government or risk chaos Opening a debate before his third confidence vote since October, he said Italy had avoided reforms for 20 years and could no longer afford to delay, with protests across the country this week underlining the bitter public mood after years of painful attempts to squeeze costs and boost revenues. I won't give in to those who say the chaos is too much and we can't do anything," he said, pledging to combat a growing tide of political disillusion and hostility to the European Union. The economy is now smaller than it was more than a decade ago and obstacles range from rampant corruption and a discredited political system to a level of tax evasion which the head of Italy's tax authority said this week was incompatible with a democratic state. As well as a new electoral law and measures to untangle the conflicting web of powers between different levels of the administration, he promised to overhaul parliament to remove the Senate's power to vote no confidence in the government.