Scrabble tile checking

Question

For tile checking in scrabble, you make four 5x5 grids of letters totalling 100 tiles. I would like to make one where all 40 horizontal and vertical words are valid. The set of

Answer 1

Here are a lot of precomputed 5x5's. Left as an exercise to the reader to find 4 compatible ones :-)

http://www.gtoal.com/wordgames/wordsquare/all5