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- $ {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.$