static void mergeLinesIntoGlyphTeachLog(S text) {
  L<S> lines = map afterSquareBracketStuff(unquoteWholeLog(text));
  Set<S> existing = asCISet(map afterSquareBracketStuff(scanLog(glyphTeachLog())));
  pnl(lines);
  pnl(existing);
  lines = listWithoutSet(lines, existing);
  if (nempty(lines)) {
    print("Have " + n2(lines, "new line") + " for glyph log.");
    //logQuoted(glyphTeachLog(), "[" + localDateWithSeconds() + "] Image " + ocrMD5OfBWImage(gi.image) + ": " + line);
  }
}