can, alex. ian, thank you so much for that. let s go to colleen keller, senior analyst of metron, inc. she worked on the air france tragedy. i know the detections have been occurring at the frequency for the black box frequency. it s a very unique frequency so they is to take them seriously. both ships were separated by 300 miles and they both heard something that could be the ping per pinger. it can t be both of them. i don t mean to parse words, though, but you say eight very unique ping, this 37.5 emission. is it an exclusively unique ping to a black box?