docs: private void dumpObjs(Object[][] objs, PrintStream out ) {
          for (int i = 0; i < objs.length; ++i) {
              for (int j = 0; j < objs[i].length; ++j) {
                  out.println(i + " " + j + " "
                      + objs[i][j]);
              } // for j
          } // for i
      }