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if(distance3 > 20 || distance1 < 13)
flag3 = 0;

if(flag1 == 1)

{
digitalWrite(led1,1);
}
if(flag1 == 0)
{

digitalWrite(led1,0);
}
if(flag2 == 1)
{
digitalWrite(led2,1);

}
if(flag2 == 0)
{
digitalWrite(led2,0);
}

if(flag3 == 1)
{
digitalWrite(led3,1);
}
if(flag3 == 0)

{
digitalWrite(led3,0);
}
}

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