Draw the analytical model: number the supports, the elements, specify the local axes of the elements, identify the unknowns.
Determine the stiffness matrix of the structure, [S]. Express all cases as a function of EI.
Determine the charge vectors, {P} and {Pf}
Use Excel or similar to determine the displacement vector, {d}.
Next, a photo appears where I list the bars and nodes, it is as it should be.