FOR

        [SIC\]FOR Loop_Variable n1 n2 n3 TO n4 BY n5 n6 TO n7
        [SIC\]FOR Loop_Variable /IN List_Variable
        [SIC\]FOR /WHILE Logical_Expression

    Open a FOR-NEXT loop to be executed for real values  in  the  list  (FOR
    Variable), or any values (including strings) given in the /IN option,
     or until a logical expression becomes false (FOR /WHILE).

    Up  to  9  loops may be nested in any way. The loop can be exited at any
    time with the command BREAK (see HELP BREAK for details).

    If the loop is entered interactively at the prompt, the  last  character
    of  the prompt becomes a ':' instead of '>', and all subsequent commands
    typed in until NEXT are the body of the loop.

    * Indexed loops: FOR Loop_Variable n1 n2 n3 TO n4 BY n5 n6 TO n7
      See HELP FOR Indexed

    * Generalized loops: FOR Loop_Variable /IN List
      See HELP FOR /IN

    * Conditional loops: FOR /WHILE Logical_Expression
      See HELP FOR /WHILE

    The Loopriable is the name of a SIC variable created by the FOR  command
    and must not be an existing variable name.