import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.*;

public class Main {
	static final int INF = 2 << 28;
	static final long INF_L = 2L << 60;
	static final int  MOD = 1000000007;
	static final long MOD_L = 1000000007L;
	static final int[] vx_4 = {1,0,-1,0};
	static final int[] vy_4 = {0,1,0,-1};
	static final int[] vx_5 = {1,0,-1,0,0};
	static final int[] vy_5 = {0,1,0,-1,0};
	static final int[] vx_8 = {1,1,1,0,0,-1,-1,-1};
	static final int[] vy_8 = {1,0,-1,1,-1,1,0,-1};
	static final int[] vx_9 = {1,1,1,0,0,0,-1,-1,-1};
	static final int[] vy_9 = {1,0,-1,1,0,-1,1,0,-1};
	
	static char[] check;
	static int idx;
	public static void main(String[] args) {	
		FastScanner sc = new FastScanner();
		PrintWriter out = new PrintWriter(System.out);
		int dataSet = sc.nextInt();
		while(dataSet-- > 0) {
			int H = sc.nextInt();
			int W = sc.nextInt();
			char[][] map = new char[H][W];
			for(int i = 0; i < H; i++) {
				map[i] = sc.next().toCharArray();
			}
			int count = 0;
			boolean[] ATZ = new boolean[26];
			int[] yMax    = new int[26];
			int[] yMin    = new int[26];
			int[] xMax    = new int[26];
			int[] xMin    = new int[26];
			Arrays.fill(xMax, -1);
			Arrays.fill(yMax, -1);
			Arrays.fill(xMin, INF);
			Arrays.fill(yMin, INF);
			for(int i = 0; i < H; i++) {
				for(int j = 0; j < W; j++) {
					if(map[i][j] != '.') {
						int tmp = map[i][j] - 'A';
						if(!ATZ[tmp]) {
							ATZ[tmp] = true;
							count++;
						}
						yMax[tmp] = Math.max(i,yMax[tmp]);
						yMin[tmp] = Math.min(i,yMin[tmp]);
						xMax[tmp] = Math.max(j,xMax[tmp]);
						xMin[tmp] = Math.min(j,xMin[tmp]);
					}
				}
			}
			boolean ok = true;
			int pre = -1;
			while(count != 0 && ok) {
				pre = count;
				IN:for(int i = 0; i < 26; i++) {
					if(!ATZ[i]) continue;
					for(int y = yMin[i]; y <= yMax[i]; y++) {
						for(int x = xMin[i]; x <= xMax[i]; x++) {
							if(map[y][x] == '.') {
								ok = false;
							}
							if(map[y][x] != ('A' + i) && map[y][x] != '?') continue IN;
						}
					}
					for(int y = yMin[i]; y <= yMax[i]; y++) {
						for(int x = xMin[i]; x <= xMax[i]; x++) {
							map[y][x] = '?';
						}
					}
					ATZ[i] = false;
					count--;
				}
				if(pre == count) {
					ok = false;
					break;
				}
			}
			if(ok) System.out.println("SAFE");
			else System.out.println("SUSPICIOUS");
		}
	}

}



class FastScanner {
    private final InputStream in = System.in;
    private final byte[] buffer = new byte[1024];
    private int ptr = 0;
    private int buflen = 0;
    private boolean hasNextByte() {
        if (ptr < buflen) {
            return true;
        }else{
            ptr = 0;
            try {
                buflen = in.read(buffer);
            } catch (IOException e) {
                e.printStackTrace();
            }
            if (buflen <= 0) {
                return false;
            }
        }
        return true;
    }
    private int readByte() { if (hasNextByte()) return buffer[ptr++]; else return -1;}
    private static boolean isPrintableChar(int c) { return 33 <= c && c <= 126;}
    private void skipUnprintable() { while(hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++;}
    public boolean hasNext() { skipUnprintable(); return hasNextByte();}
    public String next() {
        if (!hasNext()) throw new NoSuchElementException();
        StringBuilder sb = new StringBuilder();
        int b = readByte();
        while(isPrintableChar(b)) {
            sb.appendCodePoint(b);
            b = readByte();
        }
        return sb.toString();
    }
    public long nextLong() {
        if (!hasNext()) throw new NoSuchElementException();
        long n = 0;
        boolean minus = false;
        int b = readByte();
        if (b == '-') {
            minus = true;
            b = readByte();
        }
        if (b < '0' || '9' < b) {
            throw new NumberFormatException();
        }
        while(true){
            if ('0' <= b && b <= '9') {
                n *= 10;
                n += b - '0';
            }else if(b == -1 || !isPrintableChar(b)){
                return minus ? -n : n;
            }else{
                throw new NumberFormatException();
            }
            b = readByte();
        }
    }
    public int nextInt() {
    	if (!hasNext()) throw new NoSuchElementException();
        int n = 0;
        boolean minus = false;
        int b = readByte();
        if (b == '-') {
            minus = true;
            b = readByte();
        }
        if (b < '0' || '9' < b) {
            throw new NumberFormatException();
        }
        while(true){
            if ('0' <= b && b <= '9') {
                n *= 10;
                n += b - '0';
            }else if(b == -1 || !isPrintableChar(b)){
                return minus ? -n : n;
            }else{
                throw new NumberFormatException();
            }
            b = readByte();
        }
    }
}

Measured memory_bytes: 37996