You can use it via two following ways.
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Hey [RANDOM_CONTENT:there|you|buddy],
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Or in the combination of the above-mentioned default tag as follows.
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Hey [FNAME:filter:defaultvalue([RANDOM_CONTENT:there|you|buddy])],
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Result:
If there is a first name populated in the data, then it will appear as:
Hey David,
If there is not a first name populated in the data, then it will appear as following randomly:
Hello there,
or
Hey you,
or
Hey buddy,