The mere absence of wāw does not determine the category. Use an ordered diagnostic method.
StepQuestionLikely classification
1Does the second clause emphasize or substitute for the first?Complete connection
2Does the first prompt a question answered by the second?Quasi-complete connection
3Would wāw invite an unintended attachment?Quasi-complete disjunction
4Is there no suitable link, or an incompatible clause type?Possible complete disjunction
The final classification depends on grammar and context, not memorized labels alone.