on right click on sign:
	line 1 of clicked block is "Checkpoint"
	if player is on ground:
		set {_cooldown} to difference between {cp.%player%.lastused} and now
		if {_cooldown} is less than 1 seconds:
			send "prefix 1秒以上開けて設定してください"
			stop
		set {checkpoint.latest.%player%} to location of player
		set {cp.%player%.lastused} to now
		send "{@cp} チェックポイントを設定しました"
		execute console command "playsound block.note.pling master %player% ~ ~ ~ 1 1 1"
		wait 4 tick
		execute console command "playsound block.note.pling master %player% ~ ~ ~ 1 2 1"
	else:
		send "{@cpe} 空中でチェックポイントを設定することはできません!"