Abstract: An interconnection structure includes a plurality of nodes and a plurality of information elements. The plurality of nodes are arranged in a regular array having a preselected number N columns and having a preselected number S rows. The preselected number N equals n.sup.2 +n+1, where n is the order of a Perfect Difference Set of the integers {d.sub.0, d.sub.1, . . . d.sub.n }. Each node is coupled to nodes in the previous row and the subsequent row according to a diagram of interconnections. In particular, each node (s,j) is coupled to nodes (s-1, ?j+d.sub.i !(Mod N)) for i=0, 1, . . . , n; and each node (s,j) is coupled to nodes (s+1,?j+d.sub.i !(Mod N)) for i=0, 1, . . . , n. In a method of interconnecting a plurality of nodes, an order n is selected. A Perfect Difference Set comprising the set of {d.sub.0, d.sub.1, . . . d.sub.n } is selected. A plurality of nodes are arranged in a regular array having a preselected number N columns and having a preselected number S rows, the preselected number N=n.sup.

Abstract: A shooting system discharges a projectile having a chamber that stores a compressible fluid in a compressed state and having a valve mounted in a rear end of the projectile. The shooting system includes a longitudinal barrel having an opening on a front end and having a cap on a rear end. The projectile is movable within the barrel. The rear end of the projectile, the barrel, and the cap form a chamber. A striker is disposed in the cap for opening the valve of the projectile to release the fluid into the chamber to urge the projectile toward the opening of the barrel as the fluid is released. The projectile forms a hermetic seal between the projectile and the barrel to substantially contain the released fluid in the chamber until the projectile exits the opening of the barrel. A stabilizer, such as fins, may be detachably mounted to the opening of the barrel so that the projectile contacts the stabilizer and urges the stabilizer into flight to stabilize the discharged projectile.