UPDATE 2-Brazil's Petrobras sees layoff plan saving up to $9.2 bln
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RIO DE JANEIRO, April 1 (Reuters) - Brazil's embattled state-run oil company Petroleo Brasileiro SA said on Friday it will launch a voluntary layoff program to cut an estimated 12,000 jobs in a bid to save up to 33 billion reais ($9.20 billion) by 2020.