Name repetition can occur not within a genealogy but within a chain of transmission. A sequence such as “ʿImrān, from ʿImrān, from ʿImrān” can refer to three separate persons named ʿImrān.
This is not necessarily the same transmitter repeated or someone reporting from himself. Each “from” marks a separate transmission link requiring identification.
The critic distinguishes first from second and second from third ʿImrān using full names, teacher–student relationships, chronology, and evidence of hearing.