A:01 B:10 C:0010 D:0000
A:01 B:10 C:010 D:0000 (A가 C의 앞부분에 존재한다)
~cpp 01 10 0010 0000 9 01 10 010 0000 9
~cpp Set 1 is immediately decodable Set 2 is not immediately decodable