In alternate steps, the upper-left shifts to right-middle -> lower-left -> upper-left. The upper-middle and left-middle interchange places and so do the upper-right and centre and lower-middle and lower-right elements.
In alternate steps, the upper-middle, the left-middle and the right-middle elements shift one step ACW in a cyclic order while the lower three elements of the middle column shift one step downward in a cyclic order.
In the first step, three outer-corner elements shift one step in a cyclic order while the three corresponding inner elements also shift in the same way. The remaining one inner and one outer element interchange places. In the next step, the upper four and lower four elements shift one-step in a cyclic order.