How do I create a random selection of items

Based on the Vampire Survivors upgrade system, when the player levels up, he would like 3 items to appear to choose from a larger number of items, and as the same item is chosen several times, it reaches the maximum level and stops appearing.

What is the ideal way to do this, and is there an example to follow?

Hi. I have an example that I posted a long time ago that gives out random skills when leveling up. It's not perfect, maybe it will be useful. And not the forum already had similar discussions.

kibaga.org/c3-example/file_uploads/index.php

Hi. I have an example that I posted a long time ago that gives out random skills when leveling up. It's not perfect, maybe it will be useful. And not the forum already had similar discussions.

https://kibaga.org/c3-example/file_uploads/index.php?file_name=../Random-Skill-Spawn-Choice.c3p

Thank you very much, this is a good basis for me to study.