What portion is shared by the two routes to Ṭāwūs?

Isnād as Part of Religion: Transmitter Competence, Fitnah, and Connected Transmission

• Ḥammād b. Zayd → Ayyūb
• Sulaymān b. Mūsā → Ṭāwūs
• Sufyān b. ʿUyaynah → Misʿar
• ʿAbdān b. ʿUthmān → Ibn al-Mubārak