At run time, Content Analytics finds alternative search terms by using  dictionary lookup, regular expressions, or keywords that are defined directly in  the rule. To specify what type to use at run time for the matching rule, select  one of the pattern body types as shown in Figure 12-19. In the Rules to Tune Queries and Results pane (Figure 12-16 on page 467),  the Dictionary Configuration pane lists the dictionaries that are available for  query expansion. Each term that is listed in a dictionary is associated with a  number of synonyms, abbreviations, or acronyms. Each dictionary entry that  appears in the search query is supplemented by all the aliases for that entry.  The dictionary lookup also determines the expansion values. Figure 12-20 shows the panel where you create a dictionary. Within the panel,  you can add a word and its alias. Figure 12-19 Choosing the pattern type for matching Figure 12-20 Creating a dictionary where you can create an alias for words 3. If you select  Keyword term  in the previous step, enter the keywords for  matching. 4. If you select  Dictionary term  in the previous step, select the dictionary for  synonyms and abbreviation lookup. 5. If you select  Regular expression term  from the previous step (in  Figure 12-19), enter the regular expression term for the matching rule. The  rule attempts to make a match according to the defined regular expression. If  a match is made, the expansion rule is fired.  Chapter 12. Enterprise search  469