code: public static GroupAnalyzer createGroupAnalyzer(AreaImpl root)
      {
          //return new org.fit.segm.grouping.op.GroupAnalyzerByGrouping(root);
          //return new org.fit.segm.grouping.op.GroupAnalyzerBySeparators(root);
          //return new org.fit.segm.grouping.op.GroupAnalyzerByGroupingAndSeparators(root);
          //return new org.fit.segm.grouping.op.GroupAnalyzerByFlooding(root);
          return new org.fit.segm.grouping.op.GroupAnalyzerByStyles(root, 1, false);
      }
docs: Creates a group analyzer for an area using the selected implementation.
  @param root the root area for separator detection
  @return the created group analyzer