9-11 find the joint stiffness matrix Sj for a continuous beam on five simple supports having four identical spans, each of length L.

4.9-11 find the joint stiffness matrix Sj for a continuous beam on five simple supports having four identical spans, each of length L. Also, rearrange and partition the matrix into the form given by Eq. (4-8). Assume that EI is constant for all spans