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How can I set replace strings?
I meen how can I set "a" and "b" in that code?

1- I tried to turn text to one array and replace them something like this:
text=(
a a a a a a a a a a
a a a a a a a a a a
)
Get the number of items

number=${#text[@]}
Get half of it...

I want to replace only percent of occurrence of a pattern (not all, for example, half of occurrence of a pattern) in my text and it replaces randomly occurrences (or for example multiple of 3...