1 #include <iostream>
2 #include <unordered_map>
3 #include <algorithm>
4 #include <vector>
5 #include <queue>
6
7 using namespace std;
8
9 bool sppalindjudge(string s,int n)
10 {
11 char* pre = &s[0];
12 char* end = &s[n-1];
13 while(pre < end)
14 {
15 if(abs((*pre)-(*end))==0 || abs((*pre)-(*end))==2)
16 {
17 pre ++;
18 end --;
19 }
20 else
21 {
22 return false;
23 }
24 }
25 return true;
26 }
27
28 int main()
29 {
30 int T;
31 while(cin >> T)
32 {
33 while(T --)
34 {
35 int n;
36 string s;
37 cin >> n;
38 cin >> s;
39 bool result = sppalindjudge(s,n);
40 if(result)
41 cout << "YES" << endl;
42 else
43 cout << "NO" << endl;
44 }
45 }
46 return 0;
47 }
