# Parallel Letter Frequency

Count the frequency of letters in texts using parallel computation.

Parallelism is about doing things in parallel that can also be done
sequentially. A common example is counting the frequency of letters.
Create a function that returns the total frequency of each letter in a
list of texts and that employs parallelism.

The letters used consists of ASCII letters `a` to `z`, inclusive, and is case
insensitive.

## Submitting Exercises

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## Submitting Incomplete Solutions
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