Closest Numbers

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    def closestNumbers(arr):
        # Write your code here
        arr.sort()
        l1 = []
        mini = abs(arr[0]-arr[1])
        for i in range(len(arr)-1):
            if abs(arr[i]-arr[i+1])<mini:
                mini = abs(arr[i]-arr[i+1])
        for i in range(len(arr)-1):
            if abs(arr[i]-arr[i+1]) == mini:
                l1.append(arr[i])
                l1.append(arr[i+1])
        return l1