Define a function called add(x,y) that given x and y, two natural numbers as described in exercise 26, returns a natural number that represents the sum of x and y. For example,
You may NOT use convert or any form of it in your solution.
The natural numbers can be defined as the set of terms constructed from 0 and the succ(n) where n is a natural number. Write a data type called Natural that can be used to construct natural numbers like this. Use the capital letter O for your zero value so as not to be confused with the integer 0 in
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