In explicit laff (ʿalā al-tafṣīl), the first part lists members by name, such as night and day. The audience identifies each as a distinct item before encountering the predicates.
In collective laff (ʿalā al-ijmāl), a group is initially referred to as one collective body. The following clauses then distinguish what different members or parties within it say or do. The first stage need not name every party separately.
The common principle remains the same: the audience must be able to attach the later statements to the correct members or groups without an unresolved confusion.