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How to mark beverage cans in a cooler for a blind person?

I am travelling with a totally blind diabetic, and a cooler full of beverages (soda). Most of the beverages are diet, but a couple have sugar to treat low blood sugar. The blind person must be able to search in the cooler and find a sugar soda without assistance.

How can the beverage cans be marked so that a totally blind user will be able find one that contains sugar?

James Jenkins
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