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   51221
   From observational facts and theoretical arguments, groups of galaxies
   are thought to be very funny objects. They contain very old galaxies
   named elliptical galaxies, while they must be very young system
   dynamically. Therefore we propose the model that group of galaxies were
   formed quite recently in supercluster environment. We propose to
   observe one of the nearest group of galaxies, HCG68, to look for
   diffuse X-ray emission associated with supercluster.
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