Scheme of the connection among auxiliaries in a sacrifice

principal prescription ←directly contributing auxiliaries

↓

karaṇa (sacrifice)

↑

indirectly contributing auxiliaries

Directly contributing auxiliaries (ārādupakāraka), i.e., pre- and post-sacrifices, are directly linked to the prescription as its instruments.

Indirectly contributing auxiliaries (sannipātyopakāraka), such as threshing the rice grains, are connected insofar as they constitute the body of the instrument, that is, they produce the ritual substances to be used in it.