How do I match the different letters from a hunter thermostat to a Trane single package gas/heat unit ?

Is this a single Air condtioning /gas heat unit completly outside? (No inside equipment except duct work.) What letters and or numbers are you trying to match?    The standard wiring is: R-red wire (24volts), G- green wire (fan), W- white wire (heat), Y- yellow wire (cooling), C- black wire (24volt common)
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