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[CODE]def who_knows(a, b): """ a and b are lists """ c = [] for i in a: if is_mem(b, i): c.append(i) return uniqify(c) def is_mem(a, elem): for i in a: if i == elem: return True return False def uniqify(arr): b = {} for i in arr: b[i] = 1 … 
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