What is the principal function of wāw between the negative clauses of al-Kāfirūn?

Supplementary Practice 22: Comparative Rhetorical Study of Sūrat al-Kāfirūn and al-Naṣr

• Coordinating related negative statements in a reciprocal contrast
• Turning every clause into an oath
• Introducing a conditional response each time
• Making every clause circumstantial