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What extra letter is inserted, and where, to form the second Mulhaq door قَلْنَسَ?

Attached Trilateral (Mujarrad) - Bab 1: Fa'lalah & Bab 2: Fa'nalah

• An extra Noon is inserted between the Ayn and Laam letters
• An extra Hamzah is prefixed
• The last letter is doubled
• A Meem is prefixed