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sicp-all-tasks/sicp/2_002e83

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Exercise 2.83: Suppose you are designing a
generic arithmetic system for dealing with the tower of types shown in
Figure 2.25: integer, rational, real, complex. For each type (except
complex), design a procedure that raises objects of that type one level in the
tower. Show how to install a generic raise operation that will work for
each type (except complex).