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Figure 1 A view of the bicapped trigonal biprismatic [M2S12] unit (M=V/Nb) and its neighboring tetrahedral [PS4] groups. Open circles are S atoms, filled circle are Nb atoms, dark and pale gray circles are P and K atoms, respectively. Displacement ellipsoids are drawn at the 50% probability level. [Symmetry code: (i) 1 − x, −y, − + z; (ii) 0.5 − x, −y, − + z; (ii) − + x, −y, z] |