I need to identify the main categorical columns in this dataset and find their most common values with frequencies. Let me start by understanding the dataset structure better. ```json { "action": "tool_call", "reasoning": "I need to identify the main categorical columns across the dataset. The dataset card shows 13 tables with various columns. I should read the topology section to understand which columns are the key categorical dimensions.", "tool": "read_insight", "args": { "section": "topology" } } ```