1720C.cpp

#include<bits/stdc++.h>
#define ll long long
#define fast ios_base::sync_with_stdio(false);cin.tie(NULL);

#define fi(n) for(ll i=0; i<n; i++)
#define fj(n) for(ll j=0; j<n; j++)
#define fa(n) for(auto i:n)
#define fa2(n) for(auto i:n) cout<<i<<' ';
#define llt ll t; cin>>t; while(t--)

#define vi vector<int>
#define vll vector<ll>
#define vs vector<string>
#define pb push_back
#define pbx ll xx; cin>> xx; v.pb(xx);
#define pbs string xx; cin>> xx; v.pb(xx);
#define all(x) x.begin(), x.end()
#define sortall(x) sort(all(x))
#define rsortall(x) sort(all(x),greater<ll>())

#define gcd(a, b) __gcd(a, b)
#define lcm(a, b) ((a)*((b)/__gcd(a,b)))

#define nl endl;
#define endl "\n"
#define yes cout<<"YES"<<endl
#define no cout<<"NO"<<endl
#define C(x) cout<< x <<endl;
#define F i.first
#define S i.second


using namespace std;
int main(){
	ll t; cin>>t;
	while(t--){
		ll n,m,cnt=0,mn=INT_MAX; cin>>n>>m;
		char arr[n][m];

		fi(n){
			fj(m){
				cin>>arr[i][j];
				if(arr[i][j]=='1') cnt++;
			}
		}

		fi(n-1){
			fj(m-1){
				ll temp = arr[i][j] - '0' + arr[i][j+1] - '0' + arr[i+1][j] - '0' + arr[i+1][j+1] - '0' ;
				mn = min(mn,temp) ;
			}
		}

		if(mn<=2){
			cout<<cnt<<endl;
		}
		else cout<< cnt-mn +2<<endl;
	}
}