Prove that if a code, given by an encoding scheme, is uniquely decodable, with reading-left-to-right a VDR for the code, then the scheme satisfies the prefix condition. (Hint: prove the contrapositive. That is, start by supposing that the scheme does not satisfy the prefix condition, and prove that either reading-left-to-right is not a VDR for the code, or the code is not uniquely decodable.) Give an example of a scheme that does not satisfy the prefix condition for which reading-left-to-right does provide a VDR