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This format is obsolete, but is still accepted.  It combined the
functions of INST and TLIST, taking a series of
transformations and a single Geom (unit) object, and replicating
the object under each transformation.
     GROUP ... < matrices > ... unit { oogl-object }
   is still accepted and effectively translated into
     INST
     	transforms { TLIST ... <matrices> ... }
     	unit { oogl-object }