TableBikeySetSample.java

//BikeySet<Avenger, Film> avengerFilms = new TableBikeySet<>();
BikeySet<String, String> avengerFilms = new TableBikeySet<>();
avengerFilms.add("Hulk", "The Avengers");
avengerFilms.add("Iron Man", "The Avengers");
avengerFilms.add("Thor", "Avengers: Age of Ultron");
avengerFilms.add("Thor", "Thor: Ragnarok");
avengerFilms.add("Captain America", "Avengers: Infinity War");
....

if (avengerFilms.contains("Iron Man", "Black Panther")) {
    ....
}

//Films in the Set
Set<String> filmsInSet = avengerFilms.columnKeySet();

//Avengers in the Set
Set<String> avengersInSet = avengerFilms.rowKeySet();

//Iron Man Movies
List<String> ironManFilms = avengerFilms.stream()
    .filter(entry -> entry.getRow().equals("Iron Man"))
    .map(Bikey::getColumn)
    .collect(toList());

//Call to a BiFunction for each entry
bikeySet.forEach(this::doSomething);

public void doSomething(String avenger, String film) {
  ....
}