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Condensation on p-trap

My Air Conditioning unit's drain line is connected to my bathroom sink (as usual). However, the cold water in the drain line is causing condensation on the outside of the P-trap... enough condensation that it drips when the A/C unit is really running in warm months. The A/C unit is right behind the wall of the bathroom, so the drain line distance to the p-trap is very short. Any ideas how to prevent this condensation? The dripping condensation is going to start damaging the sink cabinet.

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