Question: Use the Y combinator to write a function sum that will calculate the sum of numbers 0+1+2+...+n. Use only Y, f, n, if, iszero,

Use the Y combinator to write a function sum that will calculate the sum of numbers 0+1+2+...+n. Use only Y, f, n, if, iszero, Z, plus, pred, and parentheses. Complete the template: sum = = Y(Af.An.

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