int  LR1 = 10;
int  LY1 = 11;
int  LG1 = 12;
int  LR2 = 4;
int  LY2 = 3;
int  LG2 = 2;

void setup() {
pinMode(LR1, OUTPUT);
pinMode(LY1, OUTPUT);
pinMode(LG1, OUTPUT);
pinMode(LR2, OUTPUT);
pinMode(LY2, OUTPUT);
pinMode(LG2, OUTPUT);

} 

void loop() {
digitalWrite(LR1, HIGH);
digitalWrite(LY1, LOW);
digitalWrite(LG1, LOW);
digitalWrite(LR2, LOW);
digitalWrite(LY2, LOW);
digitalWrite(LG2, HIGH);
delay(7000);
digitalWrite(LG2, LOW);
digitalWrite(LY2, HIGH);
delay(3000);
digitalWrite(LY2, LOW);
digitalWrite(LR2, HIGH);
delay(3000);
digitalWrite(LY1, HIGH);
delay(3000);
digitalWrite(LR1, LOW);
digitalWrite(LY1, LOW);
digitalWrite(LG1, HIGH);
delay(7000);
digitalWrite(LY1, HIGH);
digitalWrite(LG1, LOW);
delay(3000);
digitalWrite(LR1, HIGH);
digitalWrite(LY1, LOW);
delay(3000);
digitalWrite(LY2, HIGH);
delay(3000);
}