FOR /IN

        [SIC\]FOR Loop_Variable /IN List_Variable

    Execute a  generalized  loop,  for  all  the  values  in  List_Variable.
    List_Variable is a 1-D (or scalar) variable of any type,  i.e. numerics,
    logicals, or character strings.  The loop variable is undefined  outside
    the  loop, and must not be previously defined. It will be implicitly de-
    fined as a scalar with the same type and kind as the List_Variable.  For
    example:
            DEFINE CHARACTER*8 files[3]
            LET files "a.txt" "b.txt" "c.txt"
            FOR f /IN files
              SAY 'f'
            NEXT f
    The  loop  executes with the Loop_Variable taking the value of each ele-
    ment of the List_Variable, in order.