#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<ctype.h>
#include<iostream>
#include<vector>

using namespace std;

int data[100][100];
int h, w;
int solve( int *flag )
{
	int f = 0;
	for( int i = 0; i < 26; i ++ ){
		if( flag[i] )
			continue;
		int x1 = -1, y1 = -1, x2 = -1, y2 = -1;
		for( int x = 0; x < w; x ++ ){
			for( int y = 0; y < h; y ++ ){
				if( data[x][y] == i ){
					if( x1 < 0 || x < x1 ) x1 = x;
					if( x2 < 0 || x > x2 ) x2 = x;
					if( y1 < 0 || y < y1 ) y1 = y;
					if( y2 < 0 || y > y2 ) y2 = y;
				}
			}
		}

		if( x1 == -1 )
			continue;

		f ++;
		flag[i] = 1;
	//	printf( "%c\n", i + 'A');

		for( int x = x1; x <= x2; x ++ ){
			for( int y = y1; y <= y2; y ++ ){
				if( data[x][y] < 0 || flag[data[x][y]] == 0 )
					goto end;
			}
		}

		if( solve( flag ) ){
			flag[i] = 0;
			return 1;
		}

		end:;
		flag[i] = 0;
	}
	if( f > 0 )
	return 0;
	return 1;
}

int main(void)
{
  int c;
  scanf( "%d", &c );
  for (int i = 0; i < c; i++){
	  scanf( "%d", &h);
  	scanf( "%d", &w );
  	//printf( "%d,%d\n", h,w);
    memset( data, 0xff, sizeof(data) );
    for (int j = 0; j < h; j++){
    	scanf("%*[ \n\r]");
      for (int k = 0; k < w; k++){
      	char s[1024];
      	char c;
      	scanf( "%c", &c );
        data[k][j] = c - 'A';
   //     printf( "%c", c );
      }
     // printf("\n");
    }

    int flag[26];
    memset( flag, 0x00, sizeof(flag) );
    if( solve( flag ) )
      cout << "SAFE" << endl;
    else
      cout << "SUSPICIOUS" <<endl;
  }

  return 0;
}