greatest common factor

“The Earth will still rotate even if I’m not here
But if Earth is not here, I can’t live…

The morning where I exist, and the morning where I don’t exist…
I hope there’s some difference in them…
I don’t mind even if it’s only a little.

The time before I come into being, and the time after I have disappeared…
I hope there’s some difference in them…
I want the world to be different.”