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- (define (leaf? t)
- (and (empty-tree? (left-tree t))
- (empty-tree? (right-tree t))))
- (define (grow t v)
- (if (leaf? t) (make-tree (root t) (leaf v) (leaf v))
- (make-tree (root t) (grow (left-tree t) v) (grow (right-tree t) v))))
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