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‘I want to leave the prison and go back home to my family,’ says Aseel Mathan, 22.The lank young man left his native Wales when he was still 17, to join his brother in Mosul, the northern Iraqi city where the IS ‘caliphate’ was born.When his brother was killed, he moved across the Syrian border to Raqa, the other main hub of the now-defunct jihadist proto-state.
