#include <iostream>
#include <algorithm>
#include<cmath>
#include<cstring>
#include<cstdio>
#include<cstdlib>
#include<vector>
#include<iomanip>
#include<ctime>
#include<set>
#include<map>
#include<queue>
#include<stack>
#include<bitset>
#define sqr(x) ((x)*(x))
#define fz1(i,n) for ((i)=1;(i)<=(n);(i)++)
#define fd1(i,n) for ((i)=(n);(i)>=1;(i)--)
#define fz0g(i,n) for ((i)=0;(i)<=(n);(i)++)
#define fd0g(i,n) for ((i)=(n);(i)>=0;(i)--)
#define fz0k(i,n) for ((i)=0;(i)<(n);(i)++)
#define fd0k(i,n) for ((i)=(long long)((n)-1);(i)>=0;(i)--)
#define fz(i,x,y) for ((i)=(x);(i)<=(y);(i)++)
#define fd(i,y,x) for ((i)=(y);(i)>=(x);(i)--)
#define fzin fz1(i,n)
#define fzim fz1(i,m)
#define fzjn fz1(j,n)
#define fzjm fz1(j,m)
#define ff(c,itr) for (__typeof((c).begin()) itr=(c).begin();itr!=(c).end();++itr)
#define rdst(st,len){static char ss[len];scanf(" %s",ss);(st)=ss;}
#define inc(x,y) {x+=(y);if(x>=mod)x-=mod;}
#define dec(x,y) {x-=(y);if(x<0)x+=mod;}
#define spln(i,n) (i==n?'\n':' ')
#define fac_init(n){fac[0]=fac[1]=inv[1]=fi[0]=fi[1]=1;fz(i,2,n){fac[i]=1ll*fac[i-1]*i%mod;inv[i]=1ll*(mod-mod/i)*inv[mod%i]%mod;fi[i]=1ll*fi[i-1]*inv[i]%mod;}}
using namespace std;
inline void read(int &x)
{
    char c;int f=1;
    while(!isdigit(c=getchar()))if(c=='-')f=-1;
    x=(c&15);while(isdigit(c=getchar()))x=(x<<1)+(x<<3)+(c&15);
    x*=f;
}
const int mod=1e9+7; 
int n,m,i,j,a[15],t,ans;
int qp(int x,int y)
{
    int z=1;
    while(y){
        if(y&1){
            z=1ll*z*x%mod;
        }
        y/=2;
        x=1ll*x*x%mod;
    }
    return z;
}
int main()
{
    read(t);
    while(t--){
        read(n);
        fz1(i,n){
            read(a[i]);
        }
        reverse(a+1,a+n+1);
        ans=a[n]/2;
        fz(i,2,n){
            int t=a[i-1]/a[i]/2;
            int r=a[i],l=a[i]*(t+t)-a[i-1];
            int len=max(0,r-l),all=a[i]*2;
            int pro=1ll*len*qp(all,mod-2)%mod;
            ans=(ans+1ll*pro*(a[i-1]/2-(t+1)*a[i]/2)+1ll*(mod+1-pro)*(a[i-1]/2-t*a[i]/2))%mod;
        }
        printf("%d\n",ans);
    }
    return 0;
}