How many times is the function wordScramble() called in the given program?

public class WordScramble { public static void wordScrarnble(String rem, String scr) { if (rem.isEmpty()) { System.out.println(scr + rem); } else { for (int i= O; i < rem.length(); ++i) { wordScrarnble((rem.substring(O, i) + rem.substring(i + 1, rem.length())), (scr + rem.charAt(i))); } } }

public static void main(String args[]) {

wordScramble ( "ab" ," " ) ;

} }