# 1066 - Substrings

Time limit : 1 sMemory limit : 32 mb
Submitted : 619Accepted : 220

### Problem Description

You are given a number of case-sensitive strings of alphabetic characters, find the largest string X, such that either X, or its inverse can be found as a substring of any of the given strings.

### Input

The first line of the input file contains a single integer t (1<=t<=10), the number of test cases, followed by the input data for each test case. The first line of each test case contains a single integer n (1<=n<=100), the number of given strings, followed by n lines, each representing one string of minimum length 1 and maximum length 100. There is no extra white space before and after a string.

### Output

There should be one line per test case containing the length of the largest string found.

### Sample Input

2
3
ABCD
BCDFF
BRCD
2
rose
orchid


### Sample Output

2
2