 skill set and then there's always 10 mousetraps so we gone are the days of uh compressors where the clutch head would kick on and kick off now they all turn all the time they're constantly turning the whole system is completely a different way of controlling the freon flow in a system so you have to learn the old way you have to learn a new way you know we're up to a new um we had the r12 for many years then the 134 alpha and now we have the uh