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A
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government organization in the United States.
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A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Illustration of a pyramid registration scheme. Pairs of particles are registered to each other and combined to form the next layer of the pyramid. The process is repeated until one particle remains which is the final average. This procedure scales quadratically with the number of particles.
