1.Suppose that C is generated from a set B= {a,b} by the binary operation f and the unit operation g . List all the elements of C, . How many elements can they have C, y C,? Remember that C, is the set of all points x such that some construction sequence of length n ends with x, and so B= C cC, c C; ... 2. Prove that (A →^4.) it is not a formula

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