int MAT[4][5] = {
{2,4,6,8,0},
{1,3,5,7,9},
{3,7,1,4,5},
{5,9,2,1,-7}
};

  void setup()
  {
    Serial.begin(9600);
    for (byte l=0; l<4; l++){
      for(byte c=0; c<5; c++) {
         
        Serial.print("dados[");
        Serial.print(l);
        Serial.print("]");
        Serial.print("[");
        Serial.print(c);
        Serial.print("] = ");
        Serial.println(MAT[l][c]);
      }
      }
    }
   
  

void loop() 
{
 
}