class BiTuple<A, B> implements FactTuple {
    public final A a;
    public final B b;
    private final int hashCode;

    public BiTuple(A a, B b) {
        this.a = a;
        this.b = b;
        this.hashCode = Objects.hash(a, b);
    }

    @Override
    public List<Object> asList() {
        return Arrays.asList(a, b);
    }

    @Override
    public boolean equals(final Object o) {
        if (this == o) {
            return true;
        }
        if (o == null || !Objects.equals(getClass(), o.getClass())) {
            return false;
        }
        final BiTuple<?, ?> other = (BiTuple<?, ?>) o;
        return hashCode == other.hashCode &&
                Objects.equals(a, other.a) &&
                Objects.equals(b, other.b);
    }

    @Override
    public int hashCode() {
        return hashCode;
    }

    @Override
    public String toString() {<FILL_FUNCTION_BODY>}
}

        return "BiTuple(" + a + ", " + b + ")";
    
<no_super_class>