def _noto_relative_path(filepath):
  """Return relative path from some noto root, or None"""
  x = filepath.find('noto-fonts')
  if x == -1:
    x = filepath.find('noto-cjk')
    if x == -1:
      x = filepath.find('noto-emoji')
  if x == -1:
    return None
  return filepath[x:]