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This took me way too long and many tools, but my mind wasn't able to get it done with less.
Thank you for your interest and give a better way.
I absolutely agree with using "Left function" in the second tool, multi-row formula.
I also thought to use "Left" at first, but I would like to use the regex that is more general. That's why mine is longer than I expected.
Given the format of the column name, an easier way is to use text to column. But I have tried to use running total, and multi-row formula as a practice.
Just in case you still haven't found the answer for your spoiler question.
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Spoilers are another popular option. Click the Insert a Spoiler Tag icon to create a spoiler container. This is essentially a mini response box that will be collapsed so as not to give away any tricks for those who haven’t solved yet.
Many folks like to insert a screen capture of their workflow. Make sure your cursor is in the spoiler box and use the “Photo” icon to upload an image.
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https://community.alteryx.com/t5/Weekly-Challenge/How-to-Respond-to-a-Weekly-Challenge/td-p/429291