they are all a bit difficult to read and look similar, a bunch of sticks sums it up quite well I think.
4 engineers get into a car. It won't start. The mechanical engineer says "it's a faulty starter..." The electrical engineer says "more likely it's a dead battery..." The chemical engineer says "no, it will be impurities in the fuel..." And the IT engineer says "we should all get out of the car and then get back in again".