This is the code I have and it works, but maybe it is not efficient:
for i = 2:length(A) - 1;
if A(1,i) ~= A(1,i-1) && A(1,i) ~= A(1,i+1)
A = A(:,[1:i-1 i+1:end]);
i = i - 1;
end
end
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