Attached is a worksheet containing a simple assignment that gives an "illegal use of an object as a name" error. I created the superscripted name in the following way.
1) type b.
2) click on the Insert|Typesetting|Superscript item in the insert menu.
3) enter 1 at the cursor in the superscript position.
4) the result is a name b with superscript 1, but this symbol does not constitute a valid name for an assignment.
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Download errorws.mw