There are three engineers going by car and at some point the car shuts off without a clare reason.
Immediately the electronical engineer says: I bet that a fusible acted, turning off the electronic circuit! We just have to replace that fusible!
The mechanical engineer, instead says: I'm sure that a mechanism stopped due to lack of lubricant! We have just to wait and replace the lubricant!
Finally the "computer sience" engineer suggest: why don't we get off the car, get back in the car and try to switch on it again?
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