 that'll affect your pattern and your coverage of the product that you're spraying. Kind of that rule of thumb is 30,000 acres between a new set of tips. And of course as we look at spraying we often think about drift and mitigating the risk of our chemicals seeping where they don't belong or spreading around the fields in the wind. Now of course sometimes we think about some of these chemicals and as advanced as they are we can get a little bit in our head maybe and get a little bit confused and overthink what we need to do to be safe.