An oral composition comprising 0. Multiple nodes are typically sent a multicast message, which includes an indication of one or more designated nodes to acknowledge the message, a sequence number or other message identification value, and possibly an indication whether an immediate or delayed acknowledgment is requested. The poly-last structure has a channel silicon precursor. When the eyeglass apparatus is in the extended configuration, the lens portions are in a non-overlying configuration. By providing a hinge assembly including a substantially straight hinge pin, the assembly process can be more easily automated. In an example implementation, a leader robot can receive first sensory data captured by a first follower robot and second sensory data captured by a second follower robot, determine a command function based on at least one of the first sensory data and the second sensory data, and communicate with at least one of the first follower robot and the second follower robot based on the command function.