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The Arsac array has four probes but is placed linearly along locations 0 (zero), 1, 4 and 6 units of distance. There are a total of 6 combinations by pairing any 2 probes among the 4, but in the Arsac array, the separations of the pairing form a continuous sequence of distances of one unit to 6, with no gaps or redundancies. This means that with one setup of the 4 probes in the Arsac manner, the effective...