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The purpose of this search mode is to combine/refine previously executed searches using Boolean expressions. As operands in these expressions one can use references to previously executed searches, using \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\"Number Sign\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\"(#) followed by the request number. The request number is shown in the table (if not empty) above. The following Boolean operators are allowed:
AND, OR, NOT, AND NOT
For example:
"(#1 or #2) and (#3 or #4)"
