/a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/Set.html#contains(java.lang.Object)" title="class or interface in java.util" class="external-link">contains</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/Set.html#containsAll(java.util.Collection)" title="class or interface in java.util" class="external-link">containsAll</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/Set.html#equals(java.lang.Objec