How should “Abū ʿUthmān Muslim b. Yasār” be counted in the chain?

Avoiding Unreliable Transmitters: Critical Reception of Reports and Historical Claims

• Abū ʿUthmān and Muslim b. Yasār are two successive transmitters
• It abbreviates two alternative conflicting routes
• An unnamed transmitter intervenes between them
• It identifies one transmitter by his kunyah and personal name