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sicp-all-tasks/sicp/2_002e67

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Exercise 2.67: Define an encoding tree and a
sample message:
(define sample-tree
(make-code-tree
(make-leaf 'A 4)
(make-code-tree
(make-leaf 'B 2)
(make-code-tree
(make-leaf 'D 1)
(make-leaf 'C 1)))))
(define sample-message
'(0 1 1 0 0 1 0 1 0 1 1 1 0))
Use the decode procedure to decode the message, and give the result.