static JTextPane showLineCompedSingleLevelsAsColoredText(LineCompedSingle<Char> lc) {
  // each byte is the character's "color"
  // (0 for empty, 1 for color one, 2 for color two)
  byte[][] rows = renderLineCompedSingleLevels_raw(lc);
  S text = uncompressLineCompedSingle(lc);
  //printVars(+rows);
  int n = l(first(rows));
  new L out;
  forEach(rows, row -> {
    for i to n: {
      if (row[i] == 0) {
        out.add(Color.white);
        out.add(' ');
      } else {
        out.add(row[i] == 1 ? Color.yellow : Color.blue);
        out.add(text.charAt(i));
      }
    }
    out.add("\n");
  });
  ret withTypeWriterFont(showColoredText(out));
}