/**
 * Returns a set of common movies between two actors/actresses.
 *
 * @param actor1 Set of movies of actor1.
 * @param actor2 Set of movies of actor2.
 * @return Set of common movies between actor1 and actor2.
 */
fun commonMovies(actor1: Set<String>, actor2: Set<String>): Set<String> {

    return actor1.intersect(actor2)
}
/**
 * Returns a set of common movies between two actors/actresses.
 *
 * @param actor1 Set of movies of actor1.
 * @param actor2 Set of movies of actor2.
 * @return Set of common movies between actor1 and actor2.
 */
fun commonMovies(actor1: Set<String>, actor2: Set<String>): Set<String> {
/**
 * Returns a set of common movies between two actors/actresses.
 *
 * @param actor1 Set of movies of actor1.
 * @param actor2 Set of movies of actor2.
 * @return Set of common movies between actor1 and actor2.
 */
fun commonMovies(actor1: Set<String>, actor2: Set<String>): Set<String> {

    return actor1.intersect(actor2)
}