[Taken from Schoenfeld p. 268-9 with additions by Stephanie Wilcox.]

Consider the following magical configuration. In how many ways can you read the word "ABRACADABRA?"

A B B R R R A A A A C C C C C A A A A A A D D D D D A A A A B B B R R A

Is this similar to any problems we have done before? If so, which ones and how is it similar to the other problems? Is there a way to mathematically figure this problem without working it out by hand?

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