And we can see after 20 cycles, we're going to have over 1 million copies. After 30 cycles, we're going to have over 1 billion of these copies. And we begin with a single DNA molecule whose DNA sequence we did not actually know. And that's the great thing about the polymerase chain reaction. So we can make many, many copies over a very short period of time and we don't even have to know what that sequence of that DNA segment is. And we can carry the entire process out in a single beaker.