What is the sound distinction between ījāz al-qaṣr and ījāz al-ḥadhf?

Supplementary Practice 19: Comparative Rhetorical Analysis of Sūrat al-ʿAṣr and al-Takāthur

• Both always omit a conditional apodosis
• The first concentrates meaning in stated words; the second relies on contextual recovery of an omitted element
• The first belongs only to poetry and the second only to the Qur’an
• Both are determined solely by word count