static S asciiSideBySideWithBarsAllAround(L<S> texts) {
  S s = asciiSideBySideWithBars(texts);
  int width = maxLineLength(s);
  S x = " " + rep(width-2, '-');
  ret x + "\n" + assureTrailingNewLineIfNempty(s) + x + "\n";
}