side-rod-hole is part of:
    90%  rod-hole
    72%  loop  (indirectly)
    45%  rod  (indirectly)

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

Full expansion for side-rod-hole:
   100%  1x1 Plate w/ Horiz. Side Loop