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With the power of the internet, surely there must be some kind of material that one can print out that can act as a self-learning course for a person to learn how to read. The boys may or may not know how to read the alphabet, but they certainly know how to read numbers (from their phones).
My ideal would be if one could print out some kind of book that the teens can use to figure out how to read, and just distribute it to them. What is the best approach to go about this?