side-rod is part of:
    90%  rod

side-rod contains:
   100%  horiz-side-rod
   100%  vert-side-rod

Full expansion for side-rod:
    80%  1x1 Brick w/ Side Vert. T-Rod
    80%  1x2 Plate w/ Vert. Side Rod, Up
    80%  1x4 Plate w/ Vert. Side Rod, Down
    70%  1x2 Plate w/ Horiz. Side Rod