Question: Write the function get_alpha_string(L) that takes a 2D list of strings and returns a string containing only the alphabetical letters (a-z and A-Z) that appeared

Write the function get_alpha_string(L) that takes a 2D list of strings and returns a string containing only the alphabetical letters (a-z and A-Z) that appeared in the list, reading left-to-right, top...

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