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     See ◄Introduction to switches►
 
     If the data is not valid, run-time error 163 (Illegal character in
     numeric field (fatal)) is produced. Setting this switch to off
     suppresses this checking.
 
     Checking for valid numeric data can also be enabled in generated code
     by specifying the CHECKNUM directive. For such programs, setting this
     switch to off (-F) still disables the run-time error.
 
     See also ◄CHECKNUM►
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