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A term for the plate configuration in gonyaulacaleans in which the first apical homologue (1u) contacts the apical pore complex and where the fourth and second apical homologues (A and B) are not in contact and the fourth apical homologue (A) and first precingular homologue (2) also are not in contact. See also exsert and metasert. Refer to Text-Figures 62-63.