Assuming a raised/positive fleur-de-lis, you can do sharp outside points, but interior points (e.g. where the petals meet in the middle) are limited to the diameter of the bit being used. From there, it's hand-carving with chisels, Dremel, or whatever.. For a negative (sunken) pattern, all the corners are bit-diameter-limited. Profiling the edge after the square cuts is even more limited due to bit diameter.
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