GENOT, Rio de Janeiro (AFP) - Brazil has spent the past three weeks immersed in wall-to-wall coverage of a Senate inquiry into why Covid-19 exploded so horribly in the country - a parade of damning, sometimes comical testimony likely to damage President Jair Bolsonaro. The letters "CPI" - for parliamentary investigative commission - have been splashed across the front pages of Brazil's newspapers almost daily, while news channels carry live broadcasts of the lengthy hours of hearings. Far from the staid affair its name might suggest, the probe has been flush with insults, arguments, and episodes of general rowdiness, including a senatorial shouting match when one former official was nearly arrested on the spot for perjury.