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Symmetric Encrypted Nurikabe (61)
Instruction:
Shade some cells black (leaving the other cells white) so that the grid is divided into non-overlapping regions; cells of the same color are considered in the same region if they are adjacent along edges. Each given number must be in a white region that has the same area in cells as that number. Each white region must have exactly one given number. All black cells must be in the same region. No 2x2 group of cells can be entirely shaded black.
The numbers have been encrypted into letters before being given to you; same letters always stand for the same number, and different letters always stand for different numbers.
The region of black cells is rotationally symmetric (looks the same when rotated 180-degrees). The white regions are not necessarily symmetric.