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Since 1960, which position has served as the primary training ground for presidents?
Copper
A reddish-brown, ductile, and malleable metal that is a good conductor of heat and electricity, symbolized as Cu with an atomic number of 29.
Cobalt
A chemical element with symbol Co and atomic number 27, used in alloys, batteries, and as a blue pigment for glass and ceramics.
Bromine
A chemical element with symbol Br and atomic number 35, known for its reddish-brown color and use in various compounds.
Boron
A metalloid element with atomic number 5, used in borosilicate glass, fiberglass, and as a dopant in semiconductors, displaying properties of both metals and non-metals.
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