Example 1: “Knowledge and action both reform a person” illustrates jamʿ, since one judgment governs two subjects.
Example 2: “Rain's generosity and a scholar's intellectual generosity are both gifts, but their effects differ” has the character of tafriq, since a difference is established within a shared category.
Example 3: “Day is for work and night for rest” directly assigns two corresponding functions. If “day and night” were first grouped and the corresponding activities supplied later, the tayy wa-nashr effect would become more prominent.
The device is identified from syntactic and semantic organization, not word count alone.