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Columns or rows?

Columns, they were using a column per case instead of a row per case.

Is that definitive?

Nope! Actually going off better info now it looks like they WERE using rows, but it was in the old .xls format instead of .xlsx which limits to 2^16 rows

https://twitter.com/standupmaths/status/1313149987707072512?...

Columns.

Row limit is over 1 million.

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