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Exercise 3.36

When (define a (make-connector)) and (define b (make-connector)) are evaluated the frames E1, E2, E3 and E4 are created. When (set-value! a 10 'user) is evaluated the frame E5 is created passing a message to a in E6. Then the frame E7 is created to change the value of the connector a and call the for-each-except procedure in frame E8.