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String abcd = "a b c d";
String ABCD[4];
String sub;

void setup() {
  
  Serial.begin(9600);
  Serial.println("Hi!");
  // put your setup code here, to run once:
  int ind;
  sub = abcd;
  ind = sub.indexOf(" ");

  int var = 0;
  while (ind > 0) {
    
    ABCD[var] = sub.substring(0, ind);
    sub = sub.substring(ind + 1, sub.length() - ind+1);
    ind = sub.indexOf(" ");
    var++;
  }

  ABCD[var] = sub;
 
  for (int i = 0; i < 4; i++)
    Serial.println(ABCD[i]);
  
}