import java.util.HashSet;
class Main{
public static void main
(String[] args
) { HashSet<String> set1 = new HashSet<String>();
HashSet<String> set2 = new HashSet<String>();
set1.add( "A" );
set1.add( strB1 );
set2.add( strB2 );
set1.removeAll( set2 );
}
}
aW1wb3J0IGphdmEudXRpbC5IYXNoU2V0OwpjbGFzcyBNYWluewoJcHVibGljIHN0YXRpYyB2b2lkIG1haW4oU3RyaW5nW10gYXJncykgewoJCUhhc2hTZXQ8U3RyaW5nPiBzZXQxID0gbmV3IEhhc2hTZXQ8U3RyaW5nPigpOwoJCUhhc2hTZXQ8U3RyaW5nPiBzZXQyID0gbmV3IEhhc2hTZXQ8U3RyaW5nPigpOwoJCVN0cmluZyBzdHJCMSA9ICJCIjsKCQlTdHJpbmcgc3RyQjIgPSAiQiI7CgoJCXNldDEuYWRkKCAiQSIgKTsKCQlzZXQxLmFkZCggc3RyQjEgKTsKCQlzZXQyLmFkZCggc3RyQjIgKTsKCgkJc2V0MS5yZW1vdmVBbGwoIHNldDIgKTsKCQlTeXN0ZW0ub3V0LnByaW50bG4oc2V0MSk7Cgl9Cn0=