. . can i go through the checklist of all the things you had to conceptualize and then try to get into a design with safety in mind, promote being the safest environment in mind. >> so we really think about, you know, as somebody approaches the front door, so this idea of -- you'll so a third button locks down the. . so if be in got into the central area and somebody hit that area, to in and all those students away, giving them time to either shelter in place or nam nmslows