Can you find what comes in place of $???$
White + Black = ???
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The solution could be:
In the 3. step the 0 becomes an A, and 'd' becomes a 'b', maybe it gets mirrored on its y - axsis. Also in the 3. step the C returns in place of the E.
But this only a guess, there could be more than one answer.
An other answer could be:
F_3, because if you overlap the C and d with XOR you get A