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     Select a directive for more information.
 
     Directive     Description
 
     .ERR          Generates error if expression is true (nonzero)
     .ERRE         Generates error if expression is false (zero)
     .ERRB         Generates error if expression is blank
     .ERRNB        Generates error if expression is not blank
     .ERRDEF       Generates error if symbol is defined
     .ERRNDEF      Generates error if symbol is not defined
     .ERRDIF       Generates error if arguments are different
     .ERRIDN       Generates error if arguments are identical
 
     See also: Relational Operators, Conditional Assembly Directives
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