Display random unique number

Hi there, this is my first post. I hope got a helpful answer here.
So, I want to do a repeated task to show random number with a specific range. And the displayed number can't be the same (must be unique).
For example, I want to display number between 1 to 5 to the screen with Flash Alert. The first displayed number could be 4, then 1, 3, 5, then finally 2. The displayed number cannot be the same number that have been displayed before. I've tried to use Variable Randomize with For, but Variable Randomize not showing unique number.
How can I do that in Tasker? Is it possible? Please help me.

 

I'd say create an array with the numbers you'd like to display, then shuffle it, then each time you want to display one, pop one element off the array.
https://www.reddit.com/r/tasker/comments/1jyii5/how_to_fisheryates_shuffle/ looks like a good implementation of the shuffle (though I haven't personally tested it).