Hi Paul, apologies for the delay. I found the tile you were looking for. It is on the winter tile-set in the second column from the left, at row 22. It is in-between several other cliffs tiles with snow build-up on them that include corner tiles. Let me know if that's what you meant.
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Thanks for getting back to me! Do you mean in the sample images? There is no image that has 22 rows in the tileset. And yes, the corner piece exists in the samples, but it is not in the correct 16x16 format there. I tried extracting it, but it seems slightly angled. Or do you mean something else? Would you be able to point it out in another way, perhaps by file name? Maybe I am looking in the wrong spot entirely.