A 10-day-old child has undergone a surgery to repair cleft upper lip (''hare-lip''). Cleft upper lip has resulted from the following in this case:

Question

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Nonclosure of the second pharyngeal arch

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Nonclosure of palatine tori of maxillary processes of the first pharyngeal arch

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Nonclosure of the third pharyngeal arch

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Nonclosure of frontal and maxillary processes of the first pharyngeal arch

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Nonclosure of maxillary and mandibular processes of the first pharyngeal arch

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