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By Paul Carrel FRANKFURT (Reuters) - Two years ago, euro zone government leaders hung on Mario Draghi's every word. For financial markets, Draghi's words still count. Euro zone governments, however, seem to have forgotten the caveat. Draghi delivered his famous "whatever it takes" speech, and backed it up with a plan to buy "unlimited" amounts of bonds issued by stricken euro members - but only after governments agreed to his call for a "fiscal compact" on tougher budget discipline.