On the first day of Fedmas, Janet Yellen sent to me...

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For each of the next 12 trading days, CNBC Pro will highlight a single strategy that should work if the Federal Reserve hikes interest rates on Dec. 16, as many on Wall Street expect. We found these trades using Kensho, a powerful tool used by hedge funds to analyze historical market data.

In the holiday spirit, we will call this series the "Twelve Days of Fedmas."

And so it begins:

On the first day of Fedmas,

Janet Yellen sent to me:

A pair trade in Curr-en-cies!

If the Fed does raise rates, that will make the U.S. one of the few countries in the world with a tightening monetary policy.

So if this rate hike sparks an increase in long-term Treasury yields, which currency pairs will perform best over the subsequent one month of trading?

Using Kensho, we looked at all the one-month periods of significant moves higher in rates over the last decade...