on join:
    if {antikb.%UUID of player%} is not set:
        add "{Attributes:[{Name:""generic.knockbackResistance"",Base:1d}]}" to nbt of player
    if {antikb.%UUID of player%} is 1:
        add "{Attributes:[{Name:""generic.knockbackResistance"",Base:0d}]}" to nbt of player
command /antiknockback [<player>] [<boolean>]:
    aliases: /antikb
    permission: antikb.admin
    permission message: &4このコマンドを実行する権限がありません！
    trigger:
        if arg-1 is not set:
            send "&cUsage: /antiknockback <player> <true|false>"
        else if arg-2 is not set:
            send "&cUsage: /antiknockback <player> <true|false>"
        else if arg-2 is false:
            send "7%arg-1%のAntiKnockBackを無効にしました"
            delete {antikb.%UUID of arg-1%}
            add "{Attributes:[{Name:""generic.knockbackResistance"",Base:1d}]}" to nbt of arg-1
        else if arg-2 is true:
            send "&7%arg-1%のAntiKnockBackを無効にしました"
            set {antikb.%UUID of arg-1%} to 1
            add "{Attributes:[{Name:""generic.knockbackResistance"",Base:0d}]}" to nbt of arg-1

on damage:
    damage was caused by fall
    cancel event