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23 lines (16 sloc) 428 Bytes
(define (make-frame origin edge1 edge2)
(list origin edge1 edge2))
(define (origin-frame frame)
(car frame))
(define (edge1-frame frame)
(cadr frame))
(define (edge2-frame frame)
(caddr frame))
(define (make-frame origin edge1-frame edge2-frame)
(cons origin (cons edge1 edge2)))
(define (origin-frame frame)
(car frame))
(define (edge1-frame frame)
(cadr frame))
(define (edge2-frame frame)
(cddr frame))