How does the textbook contrast Abu Hanifa and his two students regarding fi ghadan?

Particles of Meaning: Aw, Hatta, Ila, Ala, Fi and Ba

• Abu Hanifa recognizes a qualified intention with fi present; the two students treat omission and inclusion alike
• The two students allow specified intention with fi; Abu Hanifa treats its presence and absence alike
• All three accept an end-of-day intention with fi but not without it
• All three treat the two forms identically and recognize no distinction for intention