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a/c thermostat

The A/C thermostat (or the switch which turns the compressor on) has two inputs but I have a brown, a blue/black and white/black cable. My a/c shop spliced together the blue/black and white/back cable to one input and connected the brown cable to the other input and the compressor does turn on but I was wondering which cables actually go to the thermostat and where is that third cable supposed to go?
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