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    python 3

    row= len(arr) p=row-2 n=[]

    while len(n)<=(p*p):
        for i in range(p):
            for j in range(p):
    
                summ=(arr[i][j]+arr[i][j+1]+arr[i][j+2])+(arr[i+1][j+1])+(arr[i+2][j]+arr[i+2][j+1]+arr[i+2][j+2])
    
                n.append(summ)
    
    print(max(n))