Chain A: a compiler begins with his teacher's teacher, omitting his own teacher: mu‘allaq.
Chain B: a Successor says “The Messenger of Allah ﷺ said” without naming the intermediary: mursal.
Chain C: two consecutive intermediaries B and C are missing in the middle: mu‘dal.
Chain D: two transmitters were contemporaries but credible evidence establishes they never met, yet one cites the other with “ʿan”: mursal khafi.
If the two omissions in chain C instead occur at the very beginning, the report can be both mu‘allaq and mu‘dal. A schematic label is only an initial assessment; narrator evidence and alternative routes remain important.