How to find the corresponding unit for the US Customary UOM group?

In the Unit of Measures Overview, we are asked to find out what is the corresponding unit for the US Customary UOM group. The answer given is: Either yard or food (ft).

Is there a faster way to find the answer? One way that I found out is to go through the entire list of unit and look at the UOM group mappings from properties. Both ft and yard shows m under the Metric group. However, when I am looking at the properties for m, it only shows yard under the US customary group.

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