By the way I've found something that actually is wrong with the spreadsheet :P If someone has an effigy pair blocked then there will be a -ve number of lamps used for the second skill. This means that the player will generate effigy lamps from nowhere, which are then used on the next skill that isnt maxed. For example S U O M I generates 1375.8 lamps from having mine/smith blocked, which he then dumps on firemaking, saving him 66m fm xp. Telmomarques generates 2341 effigy lamps in this way, saving 56m farm and prayer xp.