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. ```json { "action": "tool_call", "reasoning": "I need to understand the dataset structure and identify the main categorical columns. The dataset card shows 43 tables with over 2 million rows. I'll read the overview section to understand what this dataset represents and identify key categorical dimensions.", "tool": "read_insight", "args": { "section": "overview" } } ```