Vaisesika Sūtra 4.2.05

अणुसंयोगस्त्वप्रतिषिद्धः ॥५॥

aṇusaṁyogas tv apratiṣiddhaḥ ॥5॥

[अणु-संयोगः (aṇu-saṁyogaḥ) - conjunction of particles; तु (tu) - but; अप्रतिषिद्धः (apratiṣiddhaḥ) - not refuted;]

But conjunction at particle level is not refuted.