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tie %inv_index_db, $db_package, $INV_INDEX_DB_FILE, O_RDONLY, 0755 or +die "Cannot open $INV_INDEX_DB_FILE: $!"; tie %docs_db, $db_package, $DOCS_DB_FILE, O_RDONLY, 0755 or die " +Cannot open $DOCS_DB_FILE: $!";