Vaisesika Sūtra 10.2.06

कारणकारणसमवायाच्च ॥६॥

kāraṇa-kāraṇa-samavāyāt ca ॥6॥

[कारणकारणसमवायात् (kāraṇa-kāraṇa-samavāyāt) - due to inherence in the cause of the cause; च (ca) - and;]

And due to inherence of the cause in the cause.