#include <stdio.h>


int main()


{
        
        int t;
        scanf("%d",&t);
    while(t--);

        {
                int ma1[10][10];
                int ma2[10][10];
                int ma3[10][10];
                int i,j,k;


                int n1,n2,n3,m1,m2,m3;

                
                scanf("%d %d",&n1,&m1);
                
                
                
                for(i=0 ; i<n1 ; i++)

                {
                        for(j=0 ; j<m1 ; j++)

                        {
                                scanf("%d",&ma1[i][j]);
                        }
                }

        
                scanf("%d %d",&n2,&m2);
                for(i=0 ; i<n2 ; i++)
                        
                {
                        for(j=0 ; j<m2 ; j++)
                        {
                                scanf("%d",&ma2[10][10]);
                        }

                }

                if(n1!=n2 || m1!=m2)

                {
                        printf("Impossible\n");
                }

                else{
                
                        for(i=0 ; i<n1 ; i++)

                        {
                                for(j=0 ; j<m1 ; j++)
                                {
                                ma3[i][j] =        ma1[i][j] + ma2[i][j];
                                }
                        }
                        
                        printf("%d\n",&ma3[i][j]);


                }

        }


        return 0;

}



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