对于每组数据，如果不存在一个数字串是另一个串的前缀，输出一行 Set t is immediately decodable ，否则输出一行 Set t is not immediately decodable ，其中 是这一组数据的组号。
样例
样例输入
01
10
0010
0000
9
01
10
010
0000
9
样例输出
Set 1 is immediately decodable
Set 2 is not immediately decodable
数据范围与提示
原文如下：
An encoding of a set of symbols is said to be immediately decodable if no code for one symbol is the prefix of a code for another symbol. We will assume for this problem that all codes are in binary, that no two codes within a set of codes are the same, that each code has at least one bit and no more than ten bits, and that each set has at least two codes and no more than eight.