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What spelling change occurs in لَمْ يَفْعُلُوْا compared to its positive state يَفْعُلُوْنَ?

Conjugating Past Absolute Negation with "Lam" (Active & Passive)

• The final letter Noon-e-I'raabi is dropped and a silent Alif is added
• The ending changes to Fathah
• The Ayn letter gets a Kasrah
• No spelling change occurs