void setup() {
pinMode(1, OUTPUT);
pinMode(2, OUTPUT);
pinMode(3, OUTPUT);
pinMode(4, OUTPUT);
pinMode(5, OUTPUT);
pinMode(6, OUTPUT);
pinMode(7, OUTPUT);
pinMode(8, OUTPUT);
pinMode(9, OUTPUT);
pinMode(10, OUTPUT);
}

void loop() {
sec1();
sec2();
sec3();
}
void sec1(){
digitalWrite(1,1);
digitalWrite(10,1);
delay(500);
digitalWrite(1,0);
digitalWrite(10,0);
delay(500);
digitalWrite(2,1);
digitalWrite(9,1);
delay(500);
digitalWrite(2,0);
digitalWrite(9,0);
delay(500);
digitalWrite(3,1);
digitalWrite(8,1);
delay(500);
digitalWrite(3,0);
digitalWrite(8,0);
delay(500);
digitalWrite(4,1);
digitalWrite(7,1);
delay(500);
digitalWrite(4,0);
digitalWrite(7,0);
delay(500);
digitalWrite(5,1);
digitalWrite(6,1);
delay(500);
digitalWrite(5,0);
digitalWrite(6,0);
delay(1000);
}
void sec2(){
for(int i=0; i<=1; i++){
digitalWrite(i,1);
delay(500);
}
}
void sec3(){
  for(int i=9; i<=0; i--){
digitalWrite(i,1);
delay(500);
}
}