if instance_exists(op1)
{
    with (op1)
        instance_destroy()
}
if instance_exists(op2)
{
    with (op2)
        instance_destroy()
}
if instance_exists(op3)
{
    with (op3)
        instance_destroy()
}
if instance_exists(op4)
{
    with (op4)
        instance_destroy()
}
if instance_exists(op5)
{
    with (op5)
        instance_destroy()
}