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    this is my solution : Image

    **My Code In Java: **

    int temporary = Integer.MIN_VALUE;
            for( int i = 0; i < arr.size() - 2; i++){
                for( int j = 0 ; j < arr.size() - 2; j++){
                    int a = arr.get(i).get(j);
                    int b = arr.get(i).get(j+1);
                    int c = arr.get(i).get(j+2);
                    int d = arr.get(i+1).get(j+1);
                    int e = arr.get(i+2).get(j);
                    int f = arr.get(i+2).get(j+1);
                    int g = arr.get(i+2).get(j+2);
                    
                    int result = a + b + c + d + e + f + g;
                    if (result > temporary){
                        temporary = result;
                    }
                }
            }
            
            return temporary;