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import java.util.HashSet;

public class HashSetDemo16 {

public static void main(String[] args) {

HashSet<String> set = new HashSet<>();

set.add("A");

set.add("a");

set.add("B");

set.add("b");

System.out.println(set);

set.removeIf(str -> str.contains("A"));

System.out.println(set);

}

}