Regarding rugoscopy, all are true except?

Correct Answer: Primary rugae are less than 3mm
Description: View of the hard palate showing palatal rugae. Torus palatinus,a bony protrusion on the palate is also visible. Primary rugae are 5-10mm or more. Secondary rugae are 3-5mm. Fragmented rugae are less than 3mm. Palatal rugae are unique to each person. Harrison Allen, in 1889, suggested the use of palatal rugae for identity verification.
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