#define A 12
#define B 13
#define C 11
#define D 10
#define E 9
#define F 7
#define G 8

void setup() {
  for(int i=0; i<7; i++)
pinMode(i, OUTPUT);

}

void loop() {

digitalWrite(B, HIGH);
digitalWrite(C, HIGH);
delay(500);
digitalWrite(B, LOW);
digitalWrite(C, LOW);
delay(500);

digitalWrite(A, HIGH);
digitalWrite(F, HIGH);
digitalWrite(G, HIGH);
digitalWrite(C, HIGH);
digitalWrite(D, HIGH);
delay(500);
digitalWrite(A, LOW);
digitalWrite(F, LOW);
digitalWrite(G, LOW);
digitalWrite(C, LOW);
digitalWrite(D, LOW);
delay(500);

}