Javascript function that sets up game board for Word Search game

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Project Description:
The type of the game I need this function for:

I need one Javascript function that creates a gameboard for it - but no graphics.
Just return letters in an array, and also for each letter there must be an array with all the words on board that use this paricular letter {'a':['mama',' mathematics']}. The way it returns all those data is up to you.
If it is impossiblle to create board from a given list has to return info about it.

links that may be helpful. (nie wiem na ile to pomocne).

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