void setup() {
  int leds[3][3] = {{1, 2, 3}, {4,5,6}, {7,8,9}};
  for (int i = 0; i < 3; i++) {
    for (int j = 0; j < 3; j++) {
      pinMode(leds[i][j], OUTPUT);
    }
  }
}

void loop() {
  int leds[3][3] = {{1, 2, 3}, {4,5,6}, {7,8,9}};

  // put your main code here, to run repeatedly:
  for (int i = 0; i < 3; i++) {
    for (int j = 0; j < 3; j++) {
      if (leds[i][j] % 2 == 0) {
        digitalWrite(leds[i][j], HIGH);
      }
    }
  }
  delay(500);
  for (int i = 0; i < 3; i++) {
    for (int j = 0; j < 3; j++) {
      if (leds[i][j] % 2 == 0) {
        digitalWrite(leds[i][j], LOW);
      }
    }
  }
  ///////////////////////////////////////
  for (int i = 0; i < 3; i++) {
    for (int j = 0; j < 3; j++) {
      if (leds[i][j] % 2 != 0) {
        digitalWrite(leds[i][j], HIGH);
      }
    }
  }
  delay(500);
  for (int i = 0; i < 3; i++) {
    for (int j = 0; j < 3; j++) {
      if (leds[i][j] % 2 != 0) {
        digitalWrite(leds[i][j], LOW);
      }
    }
  }
}