Implement function frame-refs that returns the set of all

1. . (30 points) Implement function frame-refs that returns the set of all handles contained in the given
   frame, according to the notion of contains introduced in Lecture 16. Hint: Consider using function
   frame-fold. If your solution uses frame-fold, then the solution should not be recursive.
   (-> frame? set?)
   2. (20 points) Implement function (mem-mark contained mem ref) that returns the set of all reachable
   handles from handle ref, and takes: contained a function that takes an element of the heap and
   returns a set of handles contained in that element, mem is a heap, and ref is the initial handle, according to the memory sweep algorithm discussed in Lecture 16. An example of a contained function is
   function frames-refs for a heap of frames. Notice that function mem-mark expects a heap of any data.
   (-> (-> any/c set?) heap? handle? set?)
   3. (10 points) Implement function (mem-sweep mem to-keep) that given a heap me
   

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