Heidi Cow aghast crack northern Wall Zombies gather outside form group prepare assault this happen quickly fetch HC2 Handbook Crazy Constructions look right chapterHow build wall take set brick Select possible wall design computing number possible design leave exercise reader Place brick accord choose design this easy but Heidi Coding cow construct cow her mind keep come point 2b despite imminent danger zombie onslaught wonder possible wall build n bricksA wall set wall segment define easy version how different wall construct wall consist 1 n brick two wall different exist column c row r wall brick spot notalong n give C width wall define easy version return number different wall modulo 1063