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    This is how your solution evolves one generation:

    . . X X .           . . X X X
    . X . X X           . X . . X
    X . . . X    -->    X . . . X
    . X X X .           . X . . X
    . . X X .           . X . X .
    

    So it cant be the solution to any 3x3 pattern, since there are alive cells on the outside rim