#include<bits/stdc++.h>
using namespace std;
int n,k;
long long ss,as;
const long long M=1e9+7;
vector<int>v; 
string s[25];
inline long long mg(int x){
	if(v.size()==1){
		long long ss=1;
		for(int i=x;i<s[v[0]].size();i++) if(s[v[0]][i]=='?') ss*=2,ss%=M;
		return ss;
	}
	long long ss1=1,ss2=1,sss=0;
	vector<int>v0,v1,vp,pv;
	v0.clear();
	v1.clear();
	vp=v;
	v.clear();
	for(int i=0;i<vp.size();i++){
		if(s[vp[i]].size()<=x) continue;
		if(s[vp[i]][x]=='0') v0.push_back(vp[i]);
		else if(s[vp[i]][x]=='1') v1.push_back(vp[i]);
		else v.push_back(vp[i]);
	}
	pv=v;
	for(int i=0;i<(1<<pv.size());i++){
		for(int j=0;j<pv.size();j++){
			if(s[pv[j]].size()<=x) continue;
			if((i>>j)&1) v1.push_back(pv[j]);
			else v0.push_back(pv[j]);
		}
		v=v0;
		if(v.size()){
			ss1=mg(x+1);
			as=(as-(v0.size()-1)*ss1%M)%M;
		}
		v=v1;
		if(v.size()){
			ss2=mg(x+1);
			as=(as-(v1.size()-1)*ss2%M)%M;
		}
		sss=(sss+ss1*ss2%M)%M;
	}
	v=vp;
	return sss;
}
int main(){
	freopen("lowtea.in","r",stdin);
	freopen("lowtea.out","w",stdout); 
	ios::sync_with_stdio(false); 
	cin>>n;
	for(int i=1;i<=n;i++){
		cin>>s[i];
		for(int j=0;j<s[i].size();j++){
			if(s[i][j]=='?') k++;
		}
		ss+=s[i].size();
	}
	as=1;
	for(int i=1;i<=k;i++){
		as*=2;
		as%=M;
	}
	as=(as*ss+1)%M;
	for(int i=1;i<=n;i++){
		v.push_back(i);
	}
	mg(0);
	cout<<as;
    return 0;
}