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  Syntax:   [ELSE]IFDIF[I] textitem1, textitem2
 
            [ELSE]IFIDN[I] textitem1, textitem2
 
  See also: Conditional Assembly Directives, Relational Operators,
            .ERRDIF, .ERRIDN
 
  Description:
 
     Causes assembly of a block of statements depending on whether two
     textitems are different or identical. IFDIF assembles the block if
     <textitem1> and <textitem2> are different. IFIDN assembles the block
     if they are the same. IFDIFI and IFIDNI do the same actions but are
     not case sensitive.
     See: ◄IF Block Syntax►
 
     The <textitem1> and <textitem2> parameters are text items.
     See: ◄textitem►
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