horiz-side-rod-hole is part of:
   100%  side-rod-hole
    90%  rod-hole  (indirectly)
    72%  loop  (indirectly)
    45%  rod  (indirectly)

horiz-side-rod-hole contains:

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