Which features contribute to emphasis in inna ʿalaynā la-l-hudā?

Supplementary Practice 27 — Comparative Rhetoric of Sūrat al-Shams and Sūrat al-Layl

• Only accusative tanwīn
• Imperative plus emphatic nūn
• Inna, the emphatic lām, and preposing ʿalaynā
• Negation plus exception