on chat:
	if {prefix.%player%} is not set:
		set {prefix.%player%} to ""
	cancel event
	broadcast "%{prefix.%player%}%%player% &7>> &f%message%"

command /prefix [<player>] [<text>]:
	trigger:
		if arg-1 is not set:
			stop
		if arg-2 is not set:
			set {prefix.%arg-1%} to ""
			stop
		set {prefix.%arg-1%} to arg-2
		send "prefixを %arg-2%に変更しました"