"By crossing Slacdemic and Meek misfit, the answer is 5 and 6, but how? I still did not get it. Are the once inch apart? " I liked the way how you got to the answer. I did not realize that Slack had 4 x13 too. No, the dimensions do not necessarily have to be one inch apart. That is not given. I will wait for meek or even slack to tell how they got what they got.