sicp-all-tasks/sicp/2_002e47

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Exercise 2.47: Here are two possible
constructors for frames:
(define (make-frame origin edge1 edge2)
(list origin edge1 edge2))
(define (make-frame origin edge1 edge2)
(cons origin (cons edge1 edge2)))
For each constructor supply the appropriate selectors to produce an
implementation for frames.