UPDATE 4-Brazil's Cosan proposes $4.7 bln takeover of railway firm ALL
* ALL would hold 63.5 percent equity in new company * Cosan's Rumo would name most of the board, have control * Rumo pricing ALL shares at premium of 56 percent By Reese Ewing and Roberta Vilas Boas SAO PAULO, Feb 24 (Reuters) - Brazilian sugar and ethanol firm Cosan SA pr
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