Please post in the discussion below a solution for each region. To be clear, your post should give a number for Region A, a different number for Region B, a third number for Region C, and a fourth number for Region D. If you believe that there is no number possible for a Region, please explain why. After your initial post, read and comment on someone else's solution. If you believe their solution to be inaccurate or incomplete, explain why. If you believe their solution to be complete, comment on their explanation and what specifically they said that helped you understand their solution better.