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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.