learned we took away or maybe the largest one was a test facility in an environment similar to what you re going to be deploying in and that would be the new mexico at the bed that we established. another one was early user involvement. we talked about p-28 being a prototype system. it was developed predominantly by engineers. we got very valuable, useful feedback when they looked at that p-28 prototype. we are able to incorporate that into the actual block 1 system design. we also learned lessons going back to mr. thompson s diagram, learned lessons of latencies. they used a communication system and they introduced latencies into the system. we knew we had to take them out and we went to a microwave type of site in the block 1 design. we learned as we talked earlier about the wind moving the radar around and introducing clutter into the system and we had to introduce clutter algoriims. and p-28, which was a very valu