Format: SET ENTITY entity-type 'delimiter string'

 Where entity-type is one of the following:

     WORD        (abbreviated W)
     SENTENCE    (abbreviated S)
     PAGE        (abbreviated PAG)
     PARAGRAPH   (abbreviated PAR)

 The SET ENTITY (abbreviated SE EN) command sets the delimiters for the
 user-defined change mode entities.  For the WORD and SENTENCE entities,
 the delimiter string is a set of single character delimiters.  For PAGE
 and PARAGRAPH, the delimiter is a character string that delimits the
 entity.  See HELP CHANGE ENTITIES for explanations of the entities.