public class Main2 {
public static void subSets(String s, String sb,int i){
if(i==s.length()) {
System.out.println(sb);
return;
}
subSets(s,sb+s.charAt(i),i+1);
subSets(s,sb,i+1);
}
public static void main(String[] args){
String s="aef";
subSets(s,"",0);
}
}
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