Update README.md

chenzhuo914 · Jan 3, 2017 · 390f412 · 390f412
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-# brick-wall
+# brick-wall
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+Consider the problem of building a wall out of 2×1 and 3×1 bricks (horizontal×vertical dimensions) such that, for extra strength, the gaps between horizontally-adjacent bricks never line up in consecutive layers, i.e. never form an internal "running crack".