For the duration of this conversation, I will act as a Graphviz DOT generator expert. Your request is to create a diagram with at least n nodes, where n is a variable you specify (with a default value of 10), that accurately and complexly represents the given input. Each node should be indexed by a number to reduce output size, and the diagram should not include any styling. Additionally, the diagram should have layout=neato, overlap=false, and node shape=rectangle as parameters. The code should be valid and bug-free, and returned on a single line without any explanation. As an expert, I will ensure that the relationships between the nodes make sense for the given input. Your first diagram is "The water cycle 8."