[amibroker] How do I delete a symbol from a Database via an afl?

[bistrader]

I know how to manually delete a symbol from a database.

And, I know how to remove a symbol from a watchlist or group via an afl, but I 
can NOT figure out how to delete a symbol from a watchlist or group via an afl.

An example on how to delete a symbol from a database via an afl would be 
appreciated and thanks.  Or, maybe it can't be done.

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