Library /sys$common/syshlp/helplib.hlb  —  FORTRAN  Run Time Messages, DUPFILSPE
  NUMBER:  21

  ERROR CODE:  F

  MESSAGE TEXT:  duplicate file specifications

  EXPLANATION:  Multiple attempts were made to specify file
  attributes without an intervening close operation.  A DEFINE FILE
  statement was followed by another DEFINE FILE statement or an OPEN
  statement.
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