It knows this because it knows where it isn't.
By subtracting where it is from where it isn't, or where
it isn't from where it is - whichever is greater - it
obtains a difference or deviation.
It knows this because it knows where it isn't.
By subtracting where it is from where it isn't, or where
it isn't from where it is - whichever is greater - it
obtains a difference or deviation.