This is in Java
==
public class Permute {
public static void main(String[] args) {
permute("", "ABCD");
}
public static void permute(String parent, String s) {
if (s.length() == 2) {
System.out.println(parent + s);
System.out.println(parent + s.charAt(1) +
s.charAt(0));
} else
for (int i = 0; i < s.length(); i ++)
permute(parent+s.charAt(i),
s.substring(0, i)+s.substring(i+1));
}
}
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