int led1 = 9;
int led2 = 10;
int led3 = 11;
int led4 = 12;
int s1 = 8;
int s2 = 13;
int sw1, sw2;
void setup() {
 // put your setup code here, to run once:
 pinMode(led1, OUTPUT);
 pinMode(led2, OUTPUT);
 pinMode(led3, OUTPUT);
 pinMode(led4, OUTPUT);
 pinMode(s1, INPUT);
 pinMode(s2, INPUT);
}
void loop() {
 // put your main code here, to run repeatedly:
sw1 = digitalRead(s1);
sw2 = digitalRead(s2);
if (sw1 == LOW && sw2 == LOW) {
 for (int i=1 ; i<2 ; i++){
 digitalWrite(led1, HIGH);
 digitalWrite(led2, HIGH);
 digitalWrite(led3, LOW);
 digitalWrite(led4, LOW);
 delay(500);
 digitalWrite(led1, LOW);
 digitalWrite(led2, LOW);
 digitalWrite(led3, HIGH);
 digitalWrite(led4, HIGH);
 delay(500);
 }
}
else if (sw1 == HIGH && sw2 == LOW) {
 for (int j=1 ; j<2 ; j++){
 digitalWrite(led1, HIGH);
 delay(500);
 digitalWrite(led4, HIGH);
 delay(500);
 digitalWrite(led2, HIGH);
 delay(500);
 digitalWrite(led3, HIGH);
 delay(500);
 digitalWrite(led1, LOW);
 digitalWrite(led2, LOW);
 digitalWrite(led3, LOW);
 digitalWrite(led4, LOW);
 delay(500);
 }
}
else if (sw1 == LOW && sw2 == HIGH) {
 for (int j=1 ; j<2 ; j++){
 digitalWrite(led1, HIGH);
 digitalWrite(led2, LOW);
 digitalWrite(led3, LOW);
 digitalWrite(led4, HIGH);
 delay(500);
 digitalWrite(led1, LOW);
 digitalWrite(led2, HIGH);
 digitalWrite(led3, HIGH);
 digitalWrite(led4, LOW);
 delay(500);
 }
}
else if (sw1 == HIGH && sw2 == HIGH) {
 for (int j=1 ; j<2 ; j++){
 digitalWrite(led1, HIGH);
 digitalWrite(led3, HIGH);
 delay(500);
 digitalWrite(led1, LOW);
 digitalWrite(led3, LOW);
 digitalWrite(led2, HIGH);
 digitalWrite(led4, HIGH);
 delay(500);
 digitalWrite(led2, LOW);
 digitalWrite(led4, LOW);
 }
}
}