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Once you've opened the data, there are two approaches you can take. The first: understand what the data means conceptually, then think about what you could calculate from it. The second: look purely at the structure — which columns could be grouped together, which columns could link tables — and work from there, without worrying about meaning yet. Neither approach is wrong. For example, even if you have no idea what this spreadsheet is about, you can already see: the left table scrolls way do