int RA = 2, OA = 3, VA = 4, RB = 5, OB = 6, VB = 7;
void setup() {

for(int i=2;i<=7;i++){

pinMode(i,OUTPUT);
}
}
void loop() {
for(int i=2;i<=7;i++){

digitalWrite(i,HIGH);
delay(100);
digitalWrite(i,LOW);

}
}