B. Peculiar Movie Preferencestime limit per test2 secondsmemory limit per test512 megabytesinputstandard inputoutputstandard outputMihai plans to watch a movie. He only likes palindromic movies, so he wants to skip some (possibly zero) scenes to make the remaining parts of the movie palindromic.You are given a list s of n non-empty strings of length at most 3, representing the scenes of Mihai's movie.A subsequence of s is called awesome if it is non-empty and the concatenation of the strings in the subsequence, in order, is a palindrome.Can you help Mihai check if there is at least one awesome subsequence of s?A palindrome is a string that reads the same backward as forward, for example strings "z", "aaa", "aba", "abccba" are palindromes, but strings "codeforces", "reality", "ab" are not.A sequence a is a non-empty subsequence of a non-empty sequence b if a can be obtained from b by deletion of several (possibly zero, but not all) elements.InputThe first line of the input contains a single integer t (1 \le t \le 100) — the number of test cases. The description of test cases follows.The first line of each test case contains a single integer n (1 \le n \le 10^5) — the number of scenes in the movie.Then follows n lines, the i-th of which containing a single non-empty string s_i of length at most 3, consisting of lowercase Latin letters.It is guaranteed that the sum of n over all test cases does not exceed 10^5.OutputFor each test case, print "YES" if there is an awesome subsequence of s, or "NO" otherwise (case insensitive).ExampleInput
65zxabcczxba2abbad4codeforces3abc3abcdcba2ababOutput
YES
NO
NO
YES
YES
NO
NoteIn the first test case, an awesome subsequence of s is [ab, cc, ba]
65zxabcczxba2abbad4codeforces3abc3abcdcba2abab
YES NO NO YES YES NO 
['greedy', 'strings', '*1700']