>By spreading, I think you're referring to interleaving https://en.wikipedia.org/wiki/Burst_error-correcting_code#In https://en.wikipedia.org/wiki/Burst_error-c

>By spreading, I think you're referring to interleaving https://en.wikipedia.org/wiki/Burst_error-correcting_code#In https://en.wikipedia.org/wiki/Burst_error-correcting_code#In... , which doesn't need randomness. I stand corrected!