Sandarbhasūkti - part 8
60. Kulyāpraṇayana-nyāya
Kulyā means a channel. People dig up channels so that the water can be transferred to the fields to irrigate the crops. The main purpose is agriculture. But the water can be used for drinking, for washing clothes, for bathing. While the primary purpose is different, the same can be used to serve many other purposes. This nyāya is used to illustrate such things.