function checkString(n,bits)

substrings = [];
for i=1:(length(bits)-n+1),
	substrings = [substrings;bits(i:i+n-1)];
end
reversals = substrings(:,end:-1:1);
all = [substrings; reversals];
uniques = unique(all, 'rows');
if (size(all,1)>size(uniques,1)),
	disp('oh noooo!');
end