Here we have yesterday's board but with the dark purple line actually formed. I went ahead and reversed both the TV symmetry and the FX symmetry, so you can see how different the solve looks, even though it's inherently the same board! I think it's a very cool attribute of these colored tiles.
I'm trying to figure out a mathematical definitions for symmetries...something like moving a rigid subset such that this subset itself follows the rules that govern the rules of a pentomino makes the solve the same as the first up to rigid-subset transformation.
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