وَشَرْطُهُ: أَنْ يَكُونَ بَيْنَهُ وَبَيْنَ مَتْبُوعِهِ أَحَدُ حُرُوفِ الْعَطْفِ.
Translation: A coordinating particle must stand between the coordinated word and its preceding word.
The book defers its fuller account of the individual particles to a later section. Here the chief source examples use وَ to establish case-following and syntax.