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. Employ parallelism to calculate the total frequency of each letter in a list of texts.
You'll implement parallelism with threads: subdivide the input into chunks that code running in a thread can examine asynchronously.
Some reading material for Tcl threads:
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We explore the differences between concurrency and parallelism, looking at different approaches taken by languages such as JavaScript, Go, Elixir and Rust.
