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https://www.mathworks.com/matlabcentral/cody/problems/45355-connect-four-03
In addition to the previous problem, in this case
a 2 by 2 block will also be considered as a winning move.
For example,
x=[ 1 1 2 1 2
1 1 2 2 1
2 1 2 2 1
2 2 1 1 2]
here, there is a 2-by-2 block of 1 and 2.
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