- $ {X^A}{X^a} \\\times {\\\text{ }}{X^A}Y.\\\;$
- $ {X^A}{X^a} \\\times {\\\text{ }}{X^a}Y.\\\;$
- $ {X^A}{X^A} \\\times {\\\text{ }}{X^a}Y.$
- $ {X^a}{X^a} \\\times {\\\text{ }}{X^a}Y.$