[CHALLENGE] Boggle: clarifications

[Marty Pauley]

Some clarifications:

* words should be found case-insensitivly: the grid is guaranteed to be
  lowercase, but vocabulary may contain mixed case.

* when you see a 'q' in the grid, it magically includes the 'u': this
  means that it is impossible to ever find "qwerty" in a boggle grid.

* Boggle rules require that the words contain 3 or more letters; the
  voabulary may contain shorter words; your program should not output
  these shorter words.

-- 
Marty
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