UPDATE 2-Brazil's Odebrecht signs $2 bln leniency deal in graft case -source

BRASILIA, Dec 1 (Reuters) - Engineering firm Odebrecht SA

signed a 6.7 billion real ($1.94 billion) leniency deal on

Thursday with prosecutors in Brazil's biggest graft case,

opening the way for 77 executives to conclude plea bargains, a

source at the prosecutors office said.

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