Using the raise operation of exercise 2.83 , modify the apply-generic procedure so that it coerces its arguments to have the same type by the method of successive raising, as discussed in this section. You will need to devise a way to test which of two types is higher in the tower. Do this in a manner that is ''compatible'' with the rest of the system and will not lead to problems in adding new levels to the tower.
Nobody's finished this exercise yet. You'll be the first!
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