#include #include #include #include #define LL __int64 using namespace std; const int mod = 1000000007; const int MOD = 1000000; int f[1010] = 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char str[100010]; int n; inline int qpow(int a,int n) {int ans=1;for (;n;n>>=1,a=(LL)a*a%mod)if (n&1)ans=(LL)ans*a%mod;return ans;} inline int getf(int n) { int a = f[n/MOD]; for (int i=n/MOD*MOD+1;i<=n;i++) a = (LL)a*i%mod; return a; } inline int getc(int n) { int n2=(n+n)%mod; int bns = qpow(getf(n),mod-2); // printf("bns = %d\n",bns); int ans = (LL)qpow(n+1,mod-2)*(LL)getf(n2)%mod*(LL)bns%mod*(LL)bns%mod; return ans; } int main(void) { int T; scanf("%d",&T); while (T--) { scanf("%d%s",&n,str); int len = strlen(str); if (n%2==1||n