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SUBMIT YOUR IDEAThe "static" solution is easy enough, but the "dynamic" solution took me longer than expected. It's a good challenge to refresh knowledge of the dynamic tool. Thank you @mst3k for submitting this challenge.
I went with an iterative macro to dynamically handle different numbers of horses.
The extra credit was easy, but I though and hoped there would be a more elegant solution to the main task... :S
Extra credit: 5! = 120, n!