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Editor's note: This story contains descriptions of dead bodies.

On a busy street corner in Raqqa, Syria, a digger pushes through the rubble of a building hit by an airstrike. Onlookers shield their mouths and noses from the dust and stench of corpses of those who perished beneath.

Just streets away, three recovery workers pull out the delicate skeletons of two children from under the debris of a partially collapsed home. And across the city, in what was once Raqqa's public park, men unearth more bodies from a mass grave.

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In her simple home in a settlement in Lebanon's Bekaa Valley, next to tents sheltering other refugees from the war in Syria, Raja talks about the time when two young German men arrived at her door several months ago. They told her they were researchers for a charity.

"They seemed fine," Raja says. "They just wanted to come in and film the house. We said, 'We have nothing to hide.' They filmed everything, even the kitchen."

Raja, who is afraid to give her full name, says she wouldn't have let the men in if she'd known how the footage would be used.

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When Mohammed worked in his owner's field in Libya, bent over for hours pulling tomatoes from the soil, he would think often of the days when he was a free man.

He had lived a modern life in Zinder, Niger's second-largest city. He grew up in a good family and learned in school to speak two foreign languages — English and Arabic. "I kept thinking, I'm a human being, just like him," he says, comparing himself to a man in Libya he says enslaved him.

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