void setup() {
for(int pin=7; pin<=10; pin++){
pinMode(pin, OUTPUT);
}
}
void loop() { int t=30;
for(int i=7; i<=10; i++){
digitalWrite(i, HIGH);
delay(t);
digitalWrite(i+1, HIGH);
delay(t);
digitalWrite(i+2, HIGH);
delay(t);
digitalWrite(i, LOW);
delay(t);
digitalWrite(i+1, LOW); }
for(int i=9; i>1;i--){
  digitalWrite(i, HIGH);
 delay(t);
digitalWrite(i-1, HIGH);
delay(t);
digitalWrite(i-2, HIGH);
delay(t); 
digitalWrite(i, LOW);
delay(t);
digitalWrite(i-1, LOW);
delay(t);}}

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