NOT always reduces the search result and is infrequently used. We search for items with Exxon in the Subject Headings, then save the results in Set 6. As seen in the Figure below, this eliminates all items with reference to Exxon from the final results. Set searching works in any PALS file, both the Catalog Online and subfiles such as Magazine Index or Expanded Academic Index. Type only set numbers after the command BO, not terms.
PALS works from left to right in set searching.
You may save up to 9 sets, providing the work area can handle the number of records you find. To delete a set, use DE and the set number, eg. To retrieve or get the results of a previous set, use GE, eg. END deletes all sets and returns to the Inactive Terminal . For further HELP in performing set searching, consult a reference librarian at the 3rd floor reference desk.