Mistake: Every word ending in -ān is a diptote.
Correct method: First decide whether the word is a noun or an adjective. Then test proper-name status for nouns and the feminine pattern for adjectives.
Saʿdān and nadmān (companion sense) are the book’s counterexamples.
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Diptote Causes — Additional Alif and Nūn and Their Conditions
Mistake: Every word ending in -ān is a diptote.
Correct method: First decide whether the word is a noun or an adjective. Then test proper-name status for nouns and the feminine pattern for adjectives.
Saʿdān and nadmān (companion sense) are the book’s counterexamples.