According to the map of the world I should feel "ethnically" connected to two "communities": (a) part of the southeast quadrant of Ireland and (b) the entirety of Central Europe, much of Russia, and some bonus China?

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Basic models of flocking behavior are controlled by three simple rules: 1) separation: avoid crowding neighbours (short range repulsion); 2) alignment: steer towards average heading of neighbors; 3) cohesion: steer towards average position of neighbors (long range attraction). With these three simple rules, the flock moves in an extremely realistic way.