So, I have a list that I want to have 20 items: each item being a random 2-digit number. I want the list to have no repeats

My idea and some of my code:

when green flag clicked
repeat (20)
add (pick random (10) to (99)) to [resualt v]
end
repeat until <list has no more duplicates>
find duplicates
replaces duplicates with other random numbers
end

is there any way to make this works

https://scratch.mit.edu/projects/738503004/ <<<<there is it

Easy enough

delete [all v] of [mylist v]
set [myrand  v] to (pick random (10) to (99))
add (myrand) to [mylist v]
repeat [19]
repeat until <not <[mylist v] contains (myrand) ?>>
set [myrand  v] to (pick random (10) to (99))
end
add (myrand) to [mylist v]
end

faster way for this to work:

when flag clicked
delete all of [result v] :: lists
repeat until <(length of [result v])=(20)>
set [random num v] to (pick random (10) to (99))
if <not<list contains (random num)>> then
add (random num) to [result v]