Customowy drop z bloku irona

on break:
	set {_oredrop} random integer between 0 and 20
		if event-block is iron ore:
	
			if {_oredrop} is integer between 3 and 10:
				set event-block to stone
				give a iron ingot to the player
				wait 1 minutes
				set event-block to iron ore
		
			if {_oredrop} is integer between 11 and 20:
				set event-block to stone
				give a stone to the player
				wait 1 minutes
				set event-block to iron ore

W linijce(3,5,6,7,8,9,11,12,13,14,15) pisze mi indetation error : except 1 tab itd