Conjunction
In conjunction, multiple arrows arrive at a node and/or multiple arrows depart from it. This graph also illustrates how an extra image in a diagram can be particularly instructive.
The flow of water to the sea is a clear example of the conjunction of processes. Please note that we do not use disjunction for necessity in the diagrams. You can find an explanation on the page 'Causality and Modal Logic' (PDF).
Drain
Disclaimer
These examples of enlightening directed analytic graphs only serve to illustrate the possibilities of the concept.