LLE (string-a, string-b)

  Class:  Elemental function - Generic

  Returns a value of true if the first character string is less than
  or equal to the second character string, based on the ASCII
  collating sequence - even if the processor's default collating
  sequence is different.  In VSI Fortran, LLE is equivalent to the
  <= operator.

  The ASCII collating sequence determines the relationship between
  the arguments.

  The arguments must be character expressions.  The result is a
  LOGICAL*4 value.

  This function cannot be passed as an actual argument.