Lindy Mayfield wrote :

> Is there a  difference between the going-back-and-forth
> and the one that  goes round-and-round?  Because with the
> round-and-round I see  perfectly your analogy with the dot
> matrix printer.  But with  the going back-and-forth one I cannot.

"round-and-round"  =  old matrix printer that only printed in one direction.

"back-and-forth"  = modern matrix printer that prints in both directions.

Jan-Erik.

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