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DELETE VARIABLES var_list.
DELETE VARIABLES
deletes the specified variables from the
dictionary. It may not be used to delete all variables from the
dictionary; use NEW FILE
to do that (see NEW FILE).
DELETE VARIABLES
should not be used after defining transformations
but before executing a procedure. If it is used in such a context, it
causes the data to be read. If it is used while TEMPORARY
is in
effect, it causes the temporary transformations to become permanent.