Basic Flip Matrix Q

This is a basic Q, I’m sure - when I try to flip matrix to connect the lines in groups of three (rather than groups of 10, as it currently has it; i.e. flip columns and rows), I’m told “All paths in the input tree must have the same length.” It looks to me as though they do have the same length. What am I missing? Is there a better way to connect the three dots across? Many thanks for any help!

WAVE (26.6 KB)

Use Entwineinstead ofMerge.

WAVE (23.3 KB)

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That’s it! Thanks very much, again @HS_Kim. I didn’t know about Entwine vs. Merge. Very useful.