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aminoacetonesynthetase arteriae digitales palmares blood agglutinogen callogobius sclateri chirpaur covariant system Dembech'a didons eggyolk sputhum elastic characteristic federal reserve system (fed) inverse scattering method Kevan McCulloch-Pitts neuron single-purpose local-area network technology system tectonic superimposing transferring loop trickle down theory UHDV