Three days before the end of pre-school, Ms. Sabrena and the children sit around the table playing Bingo on boards the size of placemats. Nawal only needs one more tile to win, the Huffington Post reports. Tiny and delicate, with dark, serious eyes, she has quietly assembled a dangerous arsenal. Ms. Sabrena notices and raises an eyebrow. "You have to watch out for the quiet ones," she says. But a
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