"\t(First and last are valid indexes.)",
"\tFirst and last are valid indexes. (default all values)",
  public Enumeration listOptions() {    Vector newVector = new Vector(5);    newVector.addElement(new Option(              "\tChoose attribute to be used for selection.",              "C", 1, "-C <num>"));    newVector.addElement(new Option(              "\tNumeric value to be used for selection on numeric\n"+	      "\tattribute.\n"+	      "\t(Instances with values smaller than given value.)",              "S", 1, "-S <num>"));    newVector.addElement(new Option(              "\tRange of label indices to be used for selection on\n"+	      "\tnominal attribute.\n"+	      "\t(First and last are valid indexes.)",              "L", 1, "-L <index1,index2-index4,...>"));    newVector.addElement(new Option(	      "\tInvert matching sense.",              "V", 0, "-V"));    newVector.addElement(new Option(	      "\tWhen selecting on nominal attributes, removes header\n"	      + "\treferences to excluded values.",              "H", 0, "-H"));    return newVector.elements();  }