Hello.
I have a server with the luckperms plugin and I want to create an array there with all the ranks, called {ranks}.
I wanted to create a command to rank people really fast, with /rank [<player>] [<text>] (the text arg is the rank).
My first attempt went well:

Code (Text):

1. command /rank [<player>] [<text>]:
2.     aliases: /promote, /demote
3.     permission: rank.admin
4.     permission message: You aren't allowed to execute this command.
5.     trigger:
6.         if arg 1 is not set:
7.             send "&cPlease choose a player to rank" to player
8.             stop
9.         if arg 2 is not set:
10.             send "&cPlease choose a rank" to player
11.             stop
12.         execute command "/lp user %arg-1% parent set %arg-2%"
13.         stop

Now I want to create a system that can say whether or not the rank exists.
I need to create an array with all the ranks, and then to check if arg-2 is inside the array so I can send the player that the rank does not exist.

Any help would be appreciated so much.