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Rebel doubts FARC unity inside Colombia
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Rank-and-file rebels worry about future
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Says commanders mistreat FARC fighters
By Helen Murphy and Luis Jaime Acosta
BOGOTA, Feb 21 (Reuters) - FARC guerrilla fighters hiding out in Colombia's jungles are pessimistic about peace talks in Cuba and increasingly afraid for their future, according to a rebel commander who has just turned himself in.