A string guide system is disposed within the hollow stem of a sports racquet and guides the continuous string at least through a turn for redirecting the continuous string back out of the cavity and toward the string bed. A standard deviation profile is generated from the ISAR image, where the standard deviation profile represents a standard deviation of the ISAR image. Also disclosed are diagnostic, preventative, and therapeutic techniques, including the preparation of traditional, recombinant, and improved bacterin vaccines based on AexT for inducing immunity against A. A new approach for an SM-MIMO decoder reduces the search and sorting operations. At the same time or at a different time, the one or more indicator moves or spins.