Kit Skript with 1 use

[iOranged]

hi, i need help, i make a kit with 1 use, but i dont remember how make that. So i have 2 errors 1 with the list, example if player use /kitrank this add in a list and he cant reclaim anymore, and with other command "/removelist" i can remove the player from this list and he can reclaim again. i make this in the past, but i dont know if this work how i want.
and the other error is with the elytras and diamond pickaxe.

i use the last skript version for 1.16

My code:

command /kitrank:
    permission: kit.ranks
    permission message: &cYou don't allowed this.
    trigger:
        if {server::command::kitrank::%player%} is not set:
            set {server::command::kitrank::%player%} to "&cSolo puedes reclamar este kit 1 vez"
        else:
            equip player with air
            equip player with elytra of unbreakable 3 named "&c[Luxor&fAlas]"
            equip player with air
            equip player with air
            set slot 0 of player's inventory to 1 diamond pickaxe of efficiency 3 and unbreakable 3 named "&c[Luxor&fPico]"
            set slot 1 of player's inventory to 64 firework rocket
            set slot 2 of player's inventory to 64 firework rocket
            set slot 7 of player's inventory to 1 red shulker box

Error:

 

[MusicManSK]

command /kitrank:
    permission: kit.ranks
    permission message: &cYou don't allowed this.
    trigger:
        if {server::command::kitrank::*} do not contain player:
            add player to {server::command::kitrank::*}
        else:
            equip player with air
            equip player with unbreakable elytra named "&c[Luxor&fAlas]"
            equip player with air
            equip player with air
            set slot 0 of player's inventory to unbreakable 1 diamond pickaxe of efficiency 3 named "&c[Luxor&fPico]"
            set slot 1 of player's inventory to 64 firework rocket
            set slot 2 of player's inventory to 64 firework rocket
            set slot 7 of player's inventory to 1 red shulker box
            
command /removelist <player>:
    trigger:
        remove arg-1 from {server::command::kitrank::*}
        send "Player %arg-1% has been removed from the list!" to executor

• You don't have to enchant items with `unbreakable` enchantment, just make them unbreakable.
• For determining if player already does something you can create array and then `push` or `remove` player to/from that array and check if array contains player.

Note: Since I've changed data structure of your variable, you should clear it before first run of my code.