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So i made a Yule Log Ashes filly and i plan to remove the gray from one strand and set inheritance to that one.

But the herd helper says the combo of W1 and W2 is impossible. Does that mean if i take her to the lab and make any changes, she won't exist because it'll take that as an invalid combination? Or since it's established already, will it be okay if i make no KIT changes?