What is the role of fī al-ʿuqad in 113:4?

Supplementary Practice 24 — Comparative Rhetoric of Sūrat al-Falaq and Sūrat al-Nās

• It shifts aʿūdhu into the past tense
• It replaces innamā to create restriction
• It specifies the particular action described
• It turns al-naffāthāt into a past verb