Graph the network

A list of thirty selectors and a graph of thirty selectors contain identical information, and only one of them lets you see that two clusters share a node. That is the entire justification: humans do not detect shared elements across rows, and detect them instantly in a layout. The beginner mistake is treating the graph as an output — a picture drawn at the end for the report. It is the case's working memory, built from the first pivot, and the report is generated from it.

Decide the schema before the second node

Everything useful downstream — deduplication, centrality, querying, the report table — depends on decisions made in the first ten minutes. Two rules: