2 rows of black sqares on 20x4 LCD

Other Hardware Displays
2 
void setup() {

  lcd.begin(20, 4);

  lcd.print(0,0) ="hello world";
  lcd.print(0,1) ="2";
  lcd.print(0,2) ="3";
  lcd.print(0,3) ="hello world");

}

void loop()
{
}