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+######################################################################
+# Starting in the top left corner of a 2×2 grid, and only being able to
+# move to the right and down, there are exactly 6 routes to the bottom right corner.
+#
+#
+# How many such routes are there through a 20×20 grid?
+#
+######################################################################
+
+# Look at Pascal's triangle ;)
+
+# Solution: