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Is the pilot flame strong and hitting the thermocouple?
If the pilot flame is strong and hitting the thermocouple and the thermocouple is fairly new, then you probably have a bad gas valve. As these get older, the coils inside get weak and even a good thermocouple cannot provide enough millivolts to operate valve.
You could try replacing the thermocouple once more, but if it still won't hold in the pilot, then replace the gas valve.
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