My understanding is that if you're using a CSV or a TSV file your data needs to be in a format like this:
category,date,frequency shopping,23/7/90,9 shopping,28/7/90,9 shopping,27/7/90,9 shopping,23/8/90,9 shopping,23/9/90,9
As opposed to this:
category,date,frequency shopping,23/7/90,9 category,date,frequency shopping,28/7/90,9 category,date,frequency shopping,27/7/90,9 category,date,frequency shopping,23/8/90,9 category,date,frequency shopping,23/9/90,9
Once in the correct format, you can then you can reference the data after you import the CSV as d.category, d.date, etc.
Here is a good example of a great multi-series line chart using a TSV: https://bl.ocks.org/mbostock/3884955
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