Black color indicates value "0" & White color indicates value "1".
Number on each square is equal to the sum of the numbers
of its four neighbours (vertical & horizontal) modulo 2
(where neighbours can be either setting on squares or
the fixed, numbers (colors) on circle).
Krishna Lalith (2021). Binary or FLip-Flop Lock. (https://www.mathworks.com/matlabcentral/fileexchange/29947-binary-or-flip-flop-lock), MATLAB Central File Exchange. Retrieved .
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