"Okay, Sonar," Ty said, "you are free to go. Or you can come with us. As much as I would hate to deprive your folk of their knowledge of the last part of the S topics and the beginning of the Ts, I recommend coming with us." He was working out how to explain matters to Sonar without taking all night, but Sonar abruptly said "Okay!" and, in her scurrying way, fell into step with them.