Which contact areas of the anterior teeth are located at the center of the middle third?

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Mesial contact points between the maxillary lateral incisor and canineDistal contact regions of the maxillary central and lateral incisorsDistal contact areas between the maxillary lateral incisor and canineMesial contact surfaces of the maxillary first and second premolars

Explanation

The distal contact points between the maxillary lateral incisor and canine are situated in the middle third's center, whereas other contacts such as the mesial of lateral and canine or distal of centrals and laterals are positioned differently.