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All subsequent elements in the periodic table are radioactive.
en.wikipedia.org Improvements were made to the design and subjected to extensive testing with periodic inspections.
en.wikipedia.org Money was used primarily in the many periodic markets that were held in each town.
en.wikipedia.org All three periodic signals may be measured by taking a fourier transform of the light curve and producing a power spectrum.
en.wikipedia.org They all display self-similarity and generate, for the examples below, a periodic tiling of the plane.
en.wikipedia.org