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1. A simple "scientific" calculator.
2. Ability to take notes (a) across the page or (b) have a bookmark always visible on one of the screen edges to take you to the notes.
3. Page tabs or some such so a person can easily flip back and forth between pages.
4. Good color rendition.
5. Good graph line rendition.
6. Ability to highlight or underline in several different colors.
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