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A real life example (and English is more or less pretty common here):
- Here at the office we use electronic door locks with contactless key fobs. So you hold you keyfob in front of a "reader", and the door opens (or not).
- In the beginning all doors opened all the time, so when anyone held his key in front of the reader, they got in. There were 2 leds on the reader: "ok" and "refused". No explanation needed I guess.
- When the system became fully functional, and not all doors opened to everyone any more, a man called the helpdesk.
"Have you got spare fuses for these new electronic badges? Mine seems to be blown..."
K.
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