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Fountain Powerboats Industries, Inc. , four four-colour problem a mathematical problem to prove that any plane map can be coloured with only four colours so that no two same-coloured regio… tetra- , tetra-, before a vowel tetr-, repr. Gr. tetra-, comb. form of téttares, téttara four, as in tetrachord XVII. tetragon four-angle figure. XVII. — Gr.;… Plus Fours , Plus Fours First introduced during the 1920s, plus fours were a variation on the traditional knee pants called knickers, which had been worn by men,… Ananke , Ananke (Jupiter XII) One of the lesser satellites of Jupiter, with a diameter of 20 km; its orbit is retrograde. Elara , Elara (Jupiter VII) One of the lesser satellites of Jupiter, with a diameter of 80 km (±20 km). Himalia , Himalia (Jupiter VI) One of the lesser satellites of Jupiter, with a diameter of 170km (± 20 km).
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