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I love to see the enthusiasm behind solving more Rosetta Code problems! Thanks Sander!
I applied your filter to Wolfie! This is really cool, thanks for sharing! ![Dynamic Portrait of Wolfie][1] [1]: https://community.wolfram.com//c/portal/getImageAttachment?filename=WolfieWave.gif&userId=2166697
I found the following example in the Basic Examples section of this page of the documentation: https://reference.wolfram.com/language/ref/format/XLS.html. It exports 2 data sets, `data1` and `data2`, into 2 different sheets named Experiment 1 and...