Clarification of the Transmission Chain to Muawiyah Ibn Hakim

And whatever is narrated from Muawiyah ibn Hakim, I have narrated it from my father and from Muhammad ibn Al-Hasan - may Allah سبحانه وتعالى be pleased with them - from Saʿd ibn Abdullah, from Muawiyah ibn Hakim. And I have also narrated it from Muhammad ibn Al-Hasan - may Allah سبحانه وتعالى be pleased with him - from Muhammad ibn Al-Hasan Al-Ṣaffar, from Muawiyah ibn Hakim.