What does kāf do in ka-l-farāshi al-mabthūth?

Supplementary Practice 26 — Comparative Rhetoric of Sūrat al-Qāriʿah and Sūrat al-Tīn

• A particle of categorical negation
• A simile particle showing human dispersal through a visible image
• A jussive particle governing yakūnu
• A substitute for the oath-response lām