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Orthogonal space-time block codes (OSTBC) enjoy simple decoding, but have limited coding gain, if any. By concatenating OSTBC with an outer trellis, simple and powerful codes have been constructed, known as super-orthogonal codes or STB-TCM. In this work, we generalize these codes by exploring new code supersets, through mappings that do not induce any instantaneous modulation constellation expansion. By finding new mappings and establishing the properties of the resulting set partitions, we provide design guidelines for the labeling of the generalized code trellises. Simulations demonstrate significant coding gains resulting from our codes.