[Blindmath] Sub and superscript

[annajee82 at gmail.com]

I am using the key combo control = to subscript something, and control shift = to superscript.  This works great, except I keep having this issue where I think I have ended the sub or superscriptedtext, and keep typing without realizing that it is still in sub superscript.  I know that pressing the same keys will turn off the script, but it doesn't always appear to work.  Does anyone have any thoughts on that?
Thanks

Anna E Givens