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F6425
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     FORTRAN run-time error F6425
 
     BACKSPACE illegal for SEQUENTIAL WRITE-ONLY files
 
     The BACKSPACE statement is not allowed in files opened with
     MODE = WRITE (write-only status) since BACKSPACE requires
     reading the previous record in the file to provide
     positioning.
 
     Resolve the problem by giving the file read access or by
     avoiding the BACKSPACE statement. Note that the REWIND
     statement is valid for files opened as write-only.
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