If the name of an opening letter contains madd followed by an original still consonant but no doubling or assimilation arises, the rule is madd lazim harfi mukhaffaf. Original sukun still causes the elongation; “mukhaffaf” specifies the absence of a doubled outcome.
«قٓ» is read as «قاف», whose alif is followed by a still fa without an obligatory assimilation into the next name.
«نٓ» is read as «نون», containing a madd waw followed by a final still nun.
This differs from the word-based doubled rule in «الضَّالِّينَ»: here the reciter is pronouncing letter-names. The four types can be classified with two questions: is the location a word or letter-name, and does the following consonant become doubled or remain undoubled?