You lost me at:
"Let’s find a first 5 prime numbers, each number for each character"
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"first 5 prime number" - I would need to leave your text to figure out what that is.
It’s “the first 5 prime numbers”, native speakers of Eastern European languages often get “a” and “the” swapped around or left out completely in English.
What prime numbers are was explained earlier in it, and what first 5 is ... probably assumed that was clear enough?
