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One of my design (#1) extends to the extreme case for illiterate people.
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Yewen
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Patrick
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Scenario
Sasha browses the restaurant's menu over on FoodAware. She filters the menu by her restrictions and preferences and she sees an item she wants but it conflicts with her diet. She sees that she can make a substitution on the menu and makes a vegetarian substitution on that item. She then proceeds to the restaurant and orders the item through her server.
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