This is all the places where we are less than zero in magenta. And now of that, where are we decreasing? Well we are decreasing over this interval, right over here. So that would be negative two is less than x, which is less than negative one. So that's, we're decreasing. Of the places where we are negative, I'm taking the subset of where we are negative to think about, well where are we decreasing? We're decreasing right there.