Inlaid magic squares

An inlaid magic square is a magic square wherein magic subsquares are found, or other magic features such as magic diamonds or magic rectangles. The sums of the rows, columns and diagonals of the inlays may vary depending upon the situation.

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21125324
19513217
22231154
81692012

From this viewpoint inlaid magic squares are a generalization of concentric or bordered squares.