For use in a fastener driving tool, a fastener assembly includes a plurality of fasteners arranged in a row, each fastener including a head and an elongated shank and a carrier including a plurality of connected carrier sleeves for receiving and surrounding a portion of an associated fastener. In some implementations, a method can include receiving a communication message sent from a first user to a second user, wherein the communication message includes initiation of a live interaction. By consisting of not only a first scalar obtained by quantizing a relative velocity vector between mobile units but also a second scalar obtained by quantizing a relative position vector between mobile units as the observation amount, a relative movement between mobile units is classified in more detail. By anonymizing the user data, privacy of the users of the mobile devices is maintained. The reverse gate includes an additional curved section contained within one of the at least two curved sections to provide improved lateral thrust to the watercraft.