You need two car keys so that one is always
available even if you leave the key in the
car and lock the door.
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One of the features of my car is that you can't lock the car when the key is in the ignition.
I do have a second set of keys, in case you want to take my car for a spin.
Just don't put any more dents in it.
Thank ye.
If you think education is expensive, try ignorance.