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Is destroyed delay (Boolean operator)
        Becomes true <delay> seconds after all specified ships have been destroyed.

Returns a boolean value; Takes 2 or more arguments:
        1:      Time delay in seconds (see above).
        Rest:   Name of ship (or wing) to check status of.


In a directive event, use of this SEXP will automatically prompt the HUD directive to show a count of how many ships still need to be destroyed.