In a purported musalsal bi-l-awwaliyyah report, the repeated condition is unproven past a middle link. What is the proper description?

Comprehensive Review III: Chains, Narrators, Transmission and Biographical Criticism

• Delimit the continuity to the verified portion
• Call the whole chain unqualifiedly musalsal
• Assume the condition for each transmitter
• Treat unproven links as implicitly verified